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get-started.md

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# Get started with Claude¶

Make your first API call to Claude and build a simple web search assistant.¶

---¶

## Prerequisites¶

- An Anthropic [Console account](/)
- An [API key](/settings/keys)

## Call the API¶

<Tabs>¶
<Tab title="cURL">¶
<Steps>¶
<Step title="Set your API key">¶
GeExport your API key from the [Claude Console](/settings/keys) and set it as an environment variable:as an environment variable. The cURL command below reads it from `$ANTHROPIC_API_KEY`.

```bash¶
export ANTHROPIC_API_KEY='"your-api-key-here'"
```

To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).
</Step>¶

<Step title="Make your first API call">¶
Run this command to create a simple web search assistantSend a `POST` request to the Messages API:¶

```bash cURL¶
curl https://api.anthropic.com/v1/messages \¶
-H "Ccontent-Ttype: application/json" \¶
-H "x-api-key: $ANTHROPIC_API_KEY" \¶
-H "anthropic-version: 2023-06-01" \¶
-d '{¶
"model": "claude-opus-4-8",¶
"max_tokens": 1000,¶
"messages": [¶
{¶
"role": "user",¶
"content": "What should I search for to find the latest developments in renewable energy?"¶
}¶
]¶
}'¶
```¶

**Example output:**Claude returns a JSON response containing the assistant's message:¶

```json Output¶
{¶
"id": "msg_01HCDu5LRGeP2o7s2xGmxyx83mHbppMPd2PrVJzGMZPt2D",¶
"type": "message",¶
"role": "assistant",¶
 "model": "claude-opus-4-8",¶
 "content": [¶
{¶
"type": "text",¶
"text": "Here are some effective search strategies to find the latest renewable energy developments:\n\n## Search Terms to Use:\n- \"renewable energy news 2024\"\n- \"clean energy breakthrough\"\n- \"solar/wind/battery technology advances\"\n- \"green energy innovations\"\n- \"climate tech developments\"\n- \"energy storage solutions\"\n\n## Best Sources to Check:\n\n**News & Industry Sites:**\n- developments in renewable energy:\n\n## General Search Terms\n- \"Renewable Eenergy World\n- GreenTech Media (now Wood Mackenzie)\n- Energy Storage News\n- CleanTechnica\n- PV Magazine (for solar)\n- WindPower Engineering & Development..."¶
}¶
],¶
"model": "claude-opus-4-8"news 2025\"\n- ..."¶
}¶
],¶
"stop_reason": "end_turn",¶
"usage": {¶
"input_tokens": 21,¶
"output_tokens": 305¶
}¶
}¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="CLI">¶
<Steps>¶
<Step title="Install the CLI">¶
Install the Anthropic CLI with Homebrew:¶

```bash¶
brew install anthropics/tap/ant¶
```¶

For other installation methods, see [Installation](/docs/en/api/sdks/cli#installation) in the CLI reference.¶
</Step>¶

<Step title="Authenticate">¶
Log in with your Anthropic account:¶

```bash¶
ant auth login¶
```¶

This opens a browser-based OAuth flow. After authorizing, confirm your credential with:¶

```bash¶
ant auth status¶
```¶

On a remote host without a browser, pass `--no-browser` to get a URL you can open on another device, then paste the returned code back into the terminal. If `ANTHROPIC_API_KEY` is set in your environment, it takes precedence over the login credentials. For non-interactive environments such as CI, see [Authentication](/docs/en/api/sdks/cli#authentication).¶
</Step>¶

<Step title="Make your first API call">¶
Run this command to create a simple web search assistant`ant messages create` from your terminal:¶

```bash CLI
ant messages create \¶
--model claude-opus-4-8 \¶
--max-tokens 1000 \¶
--message '{¶
role: user,¶
content: "What should I search for to find the latest developments in renewable energy?"¶
}'¶
```¶

**Example output:**The CLI prints the JSON response:¶

```json Output¶
{¶
"id": "msg_01HCDu5LRGeP2o7s2xGmxyx8N1ycuCkM5Mzd7WhTU4fwST",¶
"type": "message",¶
"role": "assistant",¶
 "model": "claude-opus-4-8",¶
 "content": [¶
{¶
"type": "text",¶
"text": "Here are some effective search strategies to find the latest renewable energy developments:\n\n## Search Terms to Use:\n- \"renewable energy news 2024\"\n- \"clean energy breakthrough\"\n- \"solar/wind/battery technology advances\"\n- \"green energy innovations\"\n- \"climate tech developments\"\n- \"energy storage solutions\"\n\n## Best Sources to Check:\n\n**News & Industry Sites:**\n- Renewable Energy World\n- GreenTech Media (now Wood Mackenzie)\n- Energy Storage News\n- CleanTechnica\n- PV Magazine (for solar)\n- WindPower Engineering & Developmentdevelopments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."¶
}¶
],¶
 "model": "claude-opus-4-8",¶
 "stop_reason": "end_turn",¶
"usage": {
 "input_tokens": 21,
 "output_tokens": 305
 }¶
}¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="Python">¶
<Steps>¶
<Step title="Set your API key">¶
GeExport your API key from the [Claude Console](/settings/keys) and set it as an environment variable:as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.

```bash¶
export ANTHROPIC_API_KEY='"your-api-key-here'"
```¶

 To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).¶
</Step>¶

<Step title="Install the SDK">¶
Install the Anthropic Python SDK:¶

```bash</Step>¶

<Step title="Create a project and install the SDK">¶
```bash¶
mkdir claude-quickstart && cd claude-quickstart¶
python3 -m venv .venv && source .venv/bin/activate
pip install anthropic¶
```¶
</Step>¶

<Step title="Create your code">¶
Save this asCreate a file called `quickstart.py`:¶

```python Python
import anthropic¶

client = anthropic.Anthropic()¶

message = client.messages.create(¶
model="claude-opus-4-8",¶
max_tokens=1000,¶
messages=[¶
{¶
"role": "user",¶
"content": "What should I search for to find the latest developments in renewable energy?",¶
}¶
],¶
)¶
print(message.content)¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
python quickstart.py¶
```¶

**Example output:**¶
```text Output¶
[¶
TextBlock(¶
```text Output¶
[TextBlock(citations=None, text='Here are some effective search strategies forto finding the latest renewable energy developments:\n\n**developments in renewable energy:\n\n## General Search Terms to Use:**\n- "rRenewable energy news 20245"\n- "clean energy breakthroughs"\n- "solar/wind/battery technology advances"\n- "energy storage innovations"\n- "green hydrogen developments"\n- "renewable energy policy updates"\n\n**Reliable Sources to Check:**\n- **News & Analysis:** Reuters Energy, Bloomberg New Energy Finance, Greentech Media, Energy Storage News\n- **Industry Publications:** Renewable Energy World, PV Magazine, Wind Power Engineering\n- **Research Organizations:** International Energy Agency (IEA), National R...', type='text')]¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="TypeScript">¶
<Steps>¶
<Step title="Set your API key">¶
Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.¶

```bash¶
export ANTHROPIC_API_KEY="your-api-key-here"¶
```¶
</Step>¶

<Step title="Create a project and install the SDK">¶
```bash¶
mkdir claude-quickstart && cd claude-quickstart¶
npm init -y¶
npm pkg set type=module¶
npm install @anthropic-ai/sdk¶
```¶
</Step>¶

<Step title="Create your code">¶
Create a file called `quickstart.ts`:¶

```typescript TypeScript¶
import Anthropic from "@anthropic-ai/sdk";¶

const client = new Anthropic();¶

const message = await client.messages.create({¶
model: "claude-opus-4-8",¶
max_tokens: 1000,¶
messages: [¶
{¶
role: "user",¶
content: "What should I search for to find the latest developments in renewable Eenergy Laboratory (NREL)\n- **Government Sources:** Department of Energy websites, EPA clean energy updates\n\n**Specific Topics to Explore:**\n- Perovskite and next-gen solar cells\n- Offshore wind expansion\n- Grid-scale battery storage\n- Green hydrogen production\n- Carbon capture technologies\n- Smart grid innovations\n- Energy policy changes and incentives...',¶
type="text",¶
)?"¶
}¶
]¶
});¶
console.log(message.content);¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
npx tsx quickstart.ts¶
```¶

```text Output¶
[¶
{¶
type: 'text',¶
text: 'Here are some effective search strategies to find the latest developments in renewable energy:\n' +¶
'\n' +¶
'## General Search Terms\n' +¶
'- "Renewable energy news 2025"\n' +¶
'- ...'¶
}
]¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="TypeScriptC#">¶
<Steps>¶
<Step title="Set your API key">¶
Get your API key from the [Claude Console](/settings/keys) and set it as an environment variable:¶

```bash¶
export ANTHROPIC_API_KEY='your-api-key-here'¶
```¶

To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).¶
</Step>¶

<Step title="Install the SDK">¶
Install the Anthropic TypeScript SDK:¶

```bash¶
npm install @anthropic-ai/sdk¶
```¶
</Step>¶

<Step title="Create your code">¶
Save this as `quickstart.ts`:¶

```typescript¶
import Anthropic from "@anthropic-ai/sdk";¶

async function main() {¶
const anthropic = new Anthropic();¶

const msg = await anthropic.messages.create({¶
model: "claude-opus-4-8",¶
max_tokens: 1000,¶
messages: [¶
{¶
role: "user",¶
content:¶
"What should I search for to find the latest developments in renewable energy?"¶
}¶
]¶
});¶
console.log(msg);¶
}¶

main().catch(console.error);¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
npx tsx quickstart.ts¶
```¶

**Example output:**¶
```javascript Output hidelines={1..2}¶
const _ =¶
// output¶
{¶
id: "msg_01ThFHzad6Bh4TpQ6cHux9t8",¶
type: "message",¶
role: "assistant",¶
model: "claude-opus-4-8",¶
content: [¶
{¶
type: "text",¶
text:¶
"Here are some effective search strategies to find the latest renewable energy developments:\n\n" +¶
"## Search Terms to Use:\n" +¶
'- "renewable energy news 2024"\n' +¶
'- "clean energy breakthroughs"\n' +¶
'- "solar wind technology advances"\n' +¶
'- "energy storage innovations"\n' +¶
'- "green hydrogen developments"\n' +¶
'- "offshore wind projects"\n' +¶
'- "battery technology renewable"\n\n' +¶
"## Best Sources to Check:\n\n" +¶
"**News & Industry Sites:**\n" +¶
"- Renewable Energy World\n" +¶
"- CleanTechnica\n" +¶
"- GreenTech Media (now Wood Mackenzie)\n" +¶
"- Energy Storage News\n" +¶
"- PV Magazine (for solar)..."¶
}¶
],¶
stop_reason: "end_turn",¶
usage: {¶
input_tokens: 21,¶
output_tokens: 302¶
}¶
}¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="Java">¶
<Steps>¶
<Step title="Set your API key">¶
Get your API key from the [Claude Console](/settings/keys) and set it as an environment variable:¶

```bash¶
export ANTHROPIC_API_KEY='your-api-key-here'¶
```¶

To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.¶

```bash¶
export ANTHROPIC_API_KEY="your-api-key-here"¶
```¶
</Step>¶

<Step title="Create a project and install the SDK">¶
Create a new console project and add the Anthropic package:¶

```bash¶
dotnet new console -n ClaudeQuickstart¶
cd ClaudeQuickstart¶
dotnet add package Anthropic¶
```¶
</Step>¶

<Step title="Create your code">¶
Replace the contents of `Program.cs`:¶

```csharp C#¶
using Anthropic;¶
using Anthropic.Models.Messages;¶

var client = new AnthropicClient();¶

var message = await client.Messages.Create(new MessageCreateParams¶
{¶
Model = Model.ClaudeOpus4_8,¶
MaxTokens = 1000,¶
Messages =¶
[¶
new()¶
{¶
Role = Role.User,¶
Content = "What should I search for to find the latest developments in renewable energy?",¶
},¶
],¶
});¶

foreach (var block in message.Content)¶
{¶
Console.WriteLine(block);¶
}¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
dotnet run¶
```¶

```text Output¶
{¶
"type": "text",¶
"text": "Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."¶
}¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="Go">¶
<Steps>¶
<Step title="Set your API key">¶
Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.¶

```bash¶
export ANTHROPIC_API_KEY="your-api-key-here"¶
```¶
</Step>¶

<Step title="Create a project and install the SDK">¶
Create a new module and add the Anthropic SDK:¶

```bash¶
mkdir claude-quickstart && cd claude-quickstart¶
go mod init claude-quickstart¶
go get github.com/anthropics/anthropic-sdk-go¶
```¶
</Step>¶

<Step title="Create your code">¶
Create a file called `main.go`:¶

```go Go¶
package main¶

import (¶
"context"¶
"fmt"¶
"log"¶

"github.com/anthropics/anthropic-sdk-go"¶
)¶

func main() {¶
client := anthropic.NewClient()¶

message, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{¶
Model: anthropic.ModelClaudeOpus4_8,¶
MaxTokens: 1000,¶
Messages: []anthropic.MessageParam{¶
anthropic.NewUserMessage(anthropic.NewTextBlock("What should I search for to find the latest developments in renewable energy?")),¶
},¶
})¶
if err != nil {¶
log.Fatal(err)¶
}¶

fmt.Println(message.JSON.Content.Raw())¶
}¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
go run .¶
```¶

```text Output¶
[{"type":"text","text":"Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."}]¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="Java">¶
<Steps>¶
<Step title="Set your API key">¶
Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.¶

```bash¶
export ANTHROPIC_API_KEY="your-api-key-here"¶
```
</Step>¶

<Step title="Set up your project">¶
You need a JDK (25 or later) and either [Gradle](https://gradle.org/install/) or [Maven](https://maven.apache.org/install.html) on your `PATH`. Create a directory for your project with a Java source directory inside it:¶

```bash¶
mkdir -p claude-quickstart/src/main/java && cd claude-quickstart¶
```¶

Then add a build file. Find the current SDK version on [Maven Central](https://central.sonatype.com/artifact/com.anthropic/anthropic-java).¶

<Tabs>¶
<Tab title="Gradle">¶
Save this as `build.gradle.kts`:¶

```kotlin¶
plugins {¶
application¶
}¶

repositories {¶
mavenCentral()¶
}¶

java {¶
toolchain {¶
languageVersion = JavaLanguageVersion.of(25)¶
}¶
}¶

dependencies {¶
implementation("com.anthropic:anthropic-java:2.35.0")¶
}¶

application {¶
mainClass = "QuickStart"¶
}¶
```¶
</Tab>¶
<Tab title="Maven">¶
Save this as `pom.xml`:¶

```xml¶
<project xmlns="http://maven.apache.org/POM/4.0.0">¶
<modelVersion>4.0.0</modelVersion>¶
<groupId>com.example</groupId>¶
<artifactId>quickstart</artifactId>¶
<version>1.0-SNAPSHOT</version>¶
<properties>¶
<maven.compiler.release>25</maven.compiler.release>¶
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>¶
</properties>¶
<dependencies>¶
<dependency>¶
<groupId>com.anthropic</groupId>¶
<artifactId>anthropic-java</artifactId>¶
<version>2.35.0</version>¶
</dependency>¶
</dependencies>¶
</project>¶
```¶
</Tab>¶
</Tabs>¶
</Step>¶

<Step title="Create your code">¶
Save this as `QuickStart.java` in your project's Java source directory (usually `src/main/java/`):¶

```java Java
import com.anthropic.client.okhttp.AnthropicOkHttpClient;¶
import com.anthropic.models.messages.Message;¶
import com.anthropic.models.messages.MessageCreateParams;¶
import com.anthropic.models.messages.Model;¶

static void main() {¶
var client = AnthropicOkHttpClient.fromEnv();¶

var params = MessageCreateParams.builder()¶
.model(Model.CLAUDE_OPUS_4_8)¶
.maxTokens(1000)¶
.addUserMessage(¶
"What should I search for to find the latest developments in renewable energy?"¶
)¶
.build();¶

Message message = client.messages().create(params);¶
IO.println(message.content());¶
}¶
```¶
</Step>¶

<Step title="Run your code">¶
<Tabs>¶
<Tab title="Gradle">¶
```bash¶
gradle run¶
```¶
</Tab>¶
<Tab title="Maven">¶
```bash¶
mvn compile exec:java -Dexec.mainClass=QuickStart¶
```¶
</Tab>¶
</Tabs>¶

**Example output:**¶
```text Output¶
[ContentBlock{text=TextBlock{text=Here are some effective search strategies to find the latest renewable energy developments:¶

## Search Terms to Use:¶
- "renewable energy news 2024"¶
- "clean energy breakthroughs"¶
- "solar/wind/battery technology advances"¶
- "energy storage innovations"¶
- "green hydrogen developments"¶
- "renewable energy policy updates"¶

## Best Sources to Check:¶
- **News & Analysis:** Reuters Energy, Bloomberg New Energy Finance, Greentech Media¶
- **Industry Publications:** Renewable Energy World, PV Magazine, Wind Power Engineering¶
- **Research Organizations:** International Energy Agency (IEA), National Renewable Energy Laboratory (NREL)¶
- **Government Sources:** Department of Energy websites, EPA clean energy updates¶

## Specific Topics to Explore:¶
- Perovskite and next-gen solar cells¶
- Offshore wind expansion¶
- Grid-scale battery storage¶
- Green hydrogen production..., type=text}}```text Output¶
[ContentBlock{text=TextBlock{citations=, text=Here are some effective search strategies to find the latest developments in renewable energy:¶

## General Search Terms¶
- "Renewable energy news 2025"¶
- ..., type=text, additionalProperties={}}}]¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="PHP">¶
<Steps>¶
<Step title="Set your API key">¶
Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.¶

```bash¶
export ANTHROPIC_API_KEY="your-api-key-here"¶
```¶
</Step>¶

<Step title="Create a project and install the SDK">¶
```bash¶
mkdir claude-quickstart && cd claude-quickstart¶
composer require "anthropic-ai/sdk" "guzzlehttp/guzzle:^7"¶
```¶
</Step>¶

<Step title="Create your code">¶
Create a file called `quickstart.php`:¶

```php PHP¶
<?php¶
require 'vendor/autoload.php';¶

use Anthropic\Client;¶
use Anthropic\Messages\Model;¶

$client = new Client();¶

$message = $client->messages->create(¶
model: Model::CLAUDE_OPUS_4_8,¶
maxTokens: 1000,¶
messages: [¶
[¶
'role' => 'user',¶
'content' => 'What should I search for to find the latest developments in renewable energy?',¶
],¶
],¶
);¶

print_r($message->content);¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
php quickstart.php¶
```¶

```text Output¶
Array¶
(¶
[0] => Anthropic\Messages\TextBlock Object¶
(¶
[type] => text¶
[citations] =>¶
[text] => Here are some effective search strategies to find the latest developments in renewable energy:¶

## General Search Terms¶
- "Renewable energy news 2025"¶
- ...¶
)¶

)¶
```¶
</Step>¶
</Steps>¶
</Tab>¶

<Tab title="Ruby">¶
<Steps>¶
<Step title="Set your API key">¶
Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.¶

```bash¶
export ANTHROPIC_API_KEY="your-api-key-here"¶
```¶
</Step>¶

<Step title="Create a project and install the SDK">¶
```bash¶
mkdir claude-quickstart && cd claude-quickstart¶
bundle init¶
bundle add anthropic¶
```¶
</Step>¶

<Step title="Create your code">¶
Create a file called `quickstart.rb`:¶

```ruby Ruby¶
require "anthropic"¶

client = Anthropic::Client.new¶

message = client.messages.create(¶
model: Anthropic::Model::CLAUDE_OPUS_4_8,¶
max_tokens: 1000,¶
messages: [¶
{¶
role: "user",¶
content: "What should I search for to find the latest developments in renewable energy?"¶
}¶
]¶
)¶

pp message.content¶
```¶
</Step>¶

<Step title="Run your code">¶
```bash¶
bundle exec ruby quickstart.rb¶
```¶

```text Output¶
[#<Anthropic::Models::TextBlock:0xc8 {text: "Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ...", type: :text}>]¶
```¶
</Step>¶
</Steps>¶
</Tab>¶
</Tabs>¶

## Next steps¶

You made your first API call. Next, learn the Messages API patterns you'll use in every Claude integration.¶

<Card title="Working with the Messages API" icon="messages" href="/docs/en/build-with-claude/working-with-messages">¶
Learn multi-turn conversations, system prompts, stop reasons, and other core patterns.¶
</Card>¶

Once you're comfortable with the basics, explore further:¶

<CardGroup cols={3}>¶
<Card title="Models overview" icon="brain" href="/docs/en/about-claude/models/overview">¶
Compare Claude models by capability and cost.¶
</Card>¶
<Card title="Features overview" icon="list" href="/docs/en/build-with-claude/overview">¶
Browse all Claude capabilities: tools, context management, structured outputs, and more.¶
</Card>¶
<Card title="Client SDKs" icon="code-brackets" href="/docs/en/api/client-sdks">¶
Reference documentation for Python, TypeScript, Java, and other client libraries.¶
</Card>¶
</CardGroup>

Unified Diff

--- a/get-started.md
+++ b/get-started.md
@@ -7,6 +7,7 @@
 ## Prerequisites
 
 - An Anthropic [Console account](/)
+- An [API key](/settings/keys)
 
 ## Call the API
 
@@ -14,21 +15,19 @@
   <Tab title="cURL">
     <Steps>
       <Step title="Set your API key">
-        Get your API key from the [Claude Console](/settings/keys) and set it as an environment variable:
-
-        ```bash
-        export ANTHROPIC_API_KEY='your-api-key-here'
-        ```
-
-        To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).
+        Export your API key as an environment variable. The cURL command below reads it from `$ANTHROPIC_API_KEY`.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
       </Step>
 
       <Step title="Make your first API call">
-        Run this command to create a simple web search assistant:
+        Send a `POST` request to the Messages API:
 
         ```bash cURL
         curl https://api.anthropic.com/v1/messages \
-          -H "Content-Type: application/json" \
+          -H "content-type: application/json" \
           -H "x-api-key: $ANTHROPIC_API_KEY" \
           -H "anthropic-version: 2023-06-01" \
           -d '{
@@ -43,19 +42,20 @@
           }'
         ```
 
-        **Example output:**
+        Claude returns a JSON response containing the assistant's message:
+
         ```json Output
         {
-          "id": "msg_01HCDu5LRGeP2o7s2xGmxyx8",
+          "id": "msg_013mHbppMPd2PrVJzGMZPt2D",
           "type": "message",
           "role": "assistant",
+          "model": "claude-opus-4-8",
           "content": [
             {
               "type": "text",
-              "text": "Here are some effective search strategies to find the latest renewable energy developments:\n\n## Search Terms to Use:\n- \"renewable energy news 2024\"\n- \"clean energy breakthrough\"\n- \"solar/wind/battery technology advances\"\n- \"green energy innovations\"\n- \"climate tech developments\"\n- \"energy storage solutions\"\n\n## Best Sources to Check:\n\n**News & Industry Sites:**\n- Renewable Energy World\n- GreenTech Media (now Wood Mackenzie)\n- Energy Storage News\n- CleanTechnica\n- PV Magazine (for solar)\n- WindPower Engineering & Development..."
+              "text": "Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."
             }
           ],
-          "model": "claude-opus-4-8",
           "stop_reason": "end_turn",
           "usage": {
             "input_tokens": 21,
@@ -96,9 +96,9 @@
       </Step>
 
       <Step title="Make your first API call">
-        Run this command to create a simple web search assistant:
-
-        ```bash
+        Run `ant messages create` from your terminal:
+
+        ```bash CLI
         ant messages create \
           --model claude-opus-4-8 \
           --max-tokens 1000 \
@@ -108,24 +108,22 @@
           }'
         ```
 
-        **Example output:**
+        The CLI prints the JSON response:
+
         ```json Output
         {
-          "id": "msg_01HCDu5LRGeP2o7s2xGmxyx8",
+          "id": "msg_01N1ycuCkM5Mzd7WhTU4fwST",
           "type": "message",
           "role": "assistant",
+          "model": "claude-opus-4-8",
           "content": [
             {
               "type": "text",
-              "text": "Here are some effective search strategies to find the latest renewable energy developments:\n\n## Search Terms to Use:\n- \"renewable energy news 2024\"\n- \"clean energy breakthrough\"\n- \"solar/wind/battery technology advances\"\n- \"green energy innovations\"\n- \"climate tech developments\"\n- \"energy storage solutions\"\n\n## Best Sources to Check:\n\n**News & Industry Sites:**\n- Renewable Energy World\n- GreenTech Media (now Wood Mackenzie)\n- Energy Storage News\n- CleanTechnica\n- PV Magazine (for solar)\n- WindPower Engineering & Development..."
+              "text": "Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."
             }
           ],
-          "model": "claude-opus-4-8",
           "stop_reason": "end_turn",
-          "usage": {
-            "input_tokens": 21,
-            "output_tokens": 305
-          }
+          "usage": { "input_tokens": 21, "output_tokens": 305 }
         }
         ```
       </Step>
@@ -135,27 +133,25 @@
   <Tab title="Python">
     <Steps>
       <Step title="Set your API key">
-        Get your API key from the [Claude Console](/settings/keys) and set it as an environment variable:
-
-        ```bash
-        export ANTHROPIC_API_KEY='your-api-key-here'
-        ```
-
-        To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).
-      </Step>
-
-      <Step title="Install the SDK">
-        Install the Anthropic Python SDK:
-
-        ```bash
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
+      </Step>
+
+      <Step title="Create a project and install the SDK">
+        ```bash
+        mkdir claude-quickstart && cd claude-quickstart
+        python3 -m venv .venv && source .venv/bin/activate
         pip install anthropic
         ```
       </Step>
 
       <Step title="Create your code">
-        Save this as `quickstart.py`:
-
-        ```python
+        Create a file called `quickstart.py`:
+
+        ```python Python
         import anthropic
 
         client = anthropic.Anthropic()
@@ -179,108 +175,200 @@
         python quickstart.py
         ```
 
-        **Example output:**
+        ```text Output
+        [TextBlock(citations=None, text='Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- "Renewable energy news 2025"\n- ...', type='text')]
+        ```
+      </Step>
+    </Steps>
+  </Tab>
+
+  <Tab title="TypeScript">
+    <Steps>
+      <Step title="Set your API key">
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
+      </Step>
+
+      <Step title="Create a project and install the SDK">
+        ```bash
+        mkdir claude-quickstart && cd claude-quickstart
+        npm init -y
+        npm pkg set type=module
+        npm install @anthropic-ai/sdk
+        ```
+      </Step>
+
+      <Step title="Create your code">
+        Create a file called `quickstart.ts`:
+
+        ```typescript TypeScript
+        import Anthropic from "@anthropic-ai/sdk";
+
+        const client = new Anthropic();
+
+        const message = await client.messages.create({
+          model: "claude-opus-4-8",
+          max_tokens: 1000,
+          messages: [
+            {
+              role: "user",
+              content: "What should I search for to find the latest developments in renewable energy?"
+            }
+          ]
+        });
+        console.log(message.content);
+        ```
+      </Step>
+
+      <Step title="Run your code">
+        ```bash
+        npx tsx quickstart.ts
+        ```
+
         ```text Output
         [
-            TextBlock(
-                text='Here are some effective search strategies for finding the latest renewable energy developments:\n\n**Search Terms to Use:**\n- "renewable energy news 2024"\n- "clean energy breakthroughs"\n- "solar/wind/battery technology advances"\n- "energy storage innovations"\n- "green hydrogen developments"\n- "renewable energy policy updates"\n\n**Reliable Sources to Check:**\n- **News & Analysis:** Reuters Energy, Bloomberg New Energy Finance, Greentech Media, Energy Storage News\n- **Industry Publications:** Renewable Energy World, PV Magazine, Wind Power Engineering\n- **Research Organizations:** International Energy Agency (IEA), National Renewable Energy Laboratory (NREL)\n- **Government Sources:** Department of Energy websites, EPA clean energy updates\n\n**Specific Topics to Explore:**\n- Perovskite and next-gen solar cells\n- Offshore wind expansion\n- Grid-scale battery storage\n- Green hydrogen production\n- Carbon capture technologies\n- Smart grid innovations\n- Energy policy changes and incentives...',
-                type="text",
-            )
+          {
+            type: 'text',
+            text: 'Here are some effective search strategies to find the latest developments in renewable energy:\n' +
+              '\n' +
+              '## General Search Terms\n' +
+              '- "Renewable energy news 2025"\n' +
+              '- ...'
+          }
         ]
         ```
       </Step>
     </Steps>
   </Tab>
 
-  <Tab title="TypeScript">
-    <Steps>
-      <Step title="Set your API key">
-        Get your API key from the [Claude Console](/settings/keys) and set it as an environment variable:
-
-        ```bash
-        export ANTHROPIC_API_KEY='your-api-key-here'
-        ```
-
-        To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).
-      </Step>
-
-      <Step title="Install the SDK">
-        Install the Anthropic TypeScript SDK:
-
-        ```bash
-        npm install @anthropic-ai/sdk
+  <Tab title="C#">
+    <Steps>
+      <Step title="Set your API key">
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
+      </Step>
+
+      <Step title="Create a project and install the SDK">
+        Create a new console project and add the Anthropic package:
+
+        ```bash
+        dotnet new console -n ClaudeQuickstart
+        cd ClaudeQuickstart
+        dotnet add package Anthropic
         ```
       </Step>
 
       <Step title="Create your code">
-        Save this as `quickstart.ts`:
-
-```typescript
-import Anthropic from "@anthropic-ai/sdk";
-
-async function main() {
-  const anthropic = new Anthropic();
-
-  const msg = await anthropic.messages.create({
-    model: "claude-opus-4-8",
-    max_tokens: 1000,
-    messages: [
-      {
-        role: "user",
-        content:
-          "What should I search for to find the latest developments in renewable energy?"
-      }
-    ]
-  });
-  console.log(msg);
-}
-
-main().catch(console.error);
+        Replace the contents of `Program.cs`:
+
+        ```csharp C#
+        using Anthropic;
+        using Anthropic.Models.Messages;
+
+        var client = new AnthropicClient();
+
+        var message = await client.Messages.Create(new MessageCreateParams
+        {
+            Model = Model.ClaudeOpus4_8,
+            MaxTokens = 1000,
+            Messages =
+            [
+                new()
+                {
+                    Role = Role.User,
+                    Content = "What should I search for to find the latest developments in renewable energy?",
+                },
+            ],
+        });
+
+        foreach (var block in message.Content)
+        {
+            Console.WriteLine(block);
+        }
         ```
       </Step>
 
       <Step title="Run your code">
         ```bash
-        npx tsx quickstart.ts
-        ```
-
-        **Example output:**
-        ```javascript Output hidelines={1..2}
-        const _ =
-          // output
-          {
-            id: "msg_01ThFHzad6Bh4TpQ6cHux9t8",
-            type: "message",
-            role: "assistant",
-            model: "claude-opus-4-8",
-            content: [
-              {
-                type: "text",
-                text:
-                  "Here are some effective search strategies to find the latest renewable energy developments:\n\n" +
-                  "## Search Terms to Use:\n" +
-                  '- "renewable energy news 2024"\n' +
-                  '- "clean energy breakthroughs"\n' +
-                  '- "solar wind technology advances"\n' +
-                  '- "energy storage innovations"\n' +
-                  '- "green hydrogen developments"\n' +
-                  '- "offshore wind projects"\n' +
-                  '- "battery technology renewable"\n\n' +
-                  "## Best Sources to Check:\n\n" +
-                  "**News & Industry Sites:**\n" +
-                  "- Renewable Energy World\n" +
-                  "- CleanTechnica\n" +
-                  "- GreenTech Media (now Wood Mackenzie)\n" +
-                  "- Energy Storage News\n" +
-                  "- PV Magazine (for solar)..."
-              }
-            ],
-            stop_reason: "end_turn",
-            usage: {
-              input_tokens: 21,
-              output_tokens: 302
-            }
-          }
+        dotnet run
+        ```
+
+        ```text Output
+        {
+          "type": "text",
+          "text": "Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."
+        }
+        ```
+      </Step>
+    </Steps>
+  </Tab>
+
+  <Tab title="Go">
+    <Steps>
+      <Step title="Set your API key">
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
+      </Step>
+
+      <Step title="Create a project and install the SDK">
+        Create a new module and add the Anthropic SDK:
+
+        ```bash
+        mkdir claude-quickstart && cd claude-quickstart
+        go mod init claude-quickstart
+        go get github.com/anthropics/anthropic-sdk-go
+        ```
+      </Step>
+
+      <Step title="Create your code">
+        Create a file called `main.go`:
+
+        ```go Go
+        package main
+
+        import (
+        	"context"
+        	"fmt"
+        	"log"
+
+        	"github.com/anthropics/anthropic-sdk-go"
+        )
+
+        func main() {
+        	client := anthropic.NewClient()
+
+        	message, err := client.Messages.New(context.Background(), anthropic.MessageNewParams{
+        		Model:     anthropic.ModelClaudeOpus4_8,
+        		MaxTokens: 1000,
+        		Messages: []anthropic.MessageParam{
+        			anthropic.NewUserMessage(anthropic.NewTextBlock("What should I search for to find the latest developments in renewable energy?")),
+        		},
+        	})
+        	if err != nil {
+        		log.Fatal(err)
+        	}
+
+        	fmt.Println(message.JSON.Content.Raw())
+        }
+        ```
+      </Step>
+
+      <Step title="Run your code">
+        ```bash
+        go run .
+        ```
+
+        ```text Output
+        [{"type":"text","text":"Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ..."}]
         ```
       </Step>
     </Steps>
@@ -289,13 +377,11 @@
   <Tab title="Java">
     <Steps>
       <Step title="Set your API key">
-        Get your API key from the [Claude Console](/settings/keys) and set it as an environment variable:
-
-        ```bash
-        export ANTHROPIC_API_KEY='your-api-key-here'
-        ```
-
-        To persist the key across shell sessions, add the line to your shell profile (such as `~/.zshrc` or `~/.bashrc`).
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
       </Step>
 
       <Step title="Set up your project">
@@ -364,7 +450,7 @@
       <Step title="Create your code">
         Save this as `QuickStart.java` in your project's Java source directory (usually `src/main/java/`):
 
-        ```java
+        ```java Java
         import com.anthropic.client.okhttp.AnthropicOkHttpClient;
         import com.anthropic.models.messages.Message;
         import com.anthropic.models.messages.MessageCreateParams;
@@ -401,29 +487,134 @@
           </Tab>
         </Tabs>
 
-        **Example output:**
         ```text Output
-        [ContentBlock{text=TextBlock{text=Here are some effective search strategies to find the latest renewable energy developments:
-
-        ## Search Terms to Use:
-        - "renewable energy news 2024"
-        - "clean energy breakthroughs"
-        - "solar/wind/battery technology advances"
-        - "energy storage innovations"
-        - "green hydrogen developments"
-        - "renewable energy policy updates"
-
-        ## Best Sources to Check:
-        - **News & Analysis:** Reuters Energy, Bloomberg New Energy Finance, Greentech Media
-        - **Industry Publications:** Renewable Energy World, PV Magazine, Wind Power Engineering
-        - **Research Organizations:** International Energy Agency (IEA), National Renewable Energy Laboratory (NREL)
-        - **Government Sources:** Department of Energy websites, EPA clean energy updates
-
-        ## Specific Topics to Explore:
-        - Perovskite and next-gen solar cells
-        - Offshore wind expansion
-        - Grid-scale battery storage
-        - Green hydrogen production..., type=text}}]
+        [ContentBlock{text=TextBlock{citations=, text=Here are some effective search strategies to find the latest developments in renewable energy:
+
+        ## General Search Terms
+        - "Renewable energy news 2025"
+        - ..., type=text, additionalProperties={}}}]
+        ```
+      </Step>
+    </Steps>
+  </Tab>
+
+  <Tab title="PHP">
+    <Steps>
+      <Step title="Set your API key">
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
+      </Step>
+
+      <Step title="Create a project and install the SDK">
+        ```bash
+        mkdir claude-quickstart && cd claude-quickstart
+        composer require "anthropic-ai/sdk" "guzzlehttp/guzzle:^7"
+        ```
+      </Step>
+
+      <Step title="Create your code">
+        Create a file called `quickstart.php`:
+
+        ```php PHP
+        <?php
+        require 'vendor/autoload.php';
+
+        use Anthropic\Client;
+        use Anthropic\Messages\Model;
+
+        $client = new Client();
+
+        $message = $client->messages->create(
+            model: Model::CLAUDE_OPUS_4_8,
+            maxTokens: 1000,
+            messages: [
+                [
+                    'role' => 'user',
+                    'content' => 'What should I search for to find the latest developments in renewable energy?',
+                ],
+            ],
+        );
+
+        print_r($message->content);
+        ```
+      </Step>
+
+      <Step title="Run your code">
+        ```bash
+        php quickstart.php
+        ```
+
+        ```text Output
+        Array
+        (
+            [0] => Anthropic\Messages\TextBlock Object
+                (
+                    [type] => text
+                    [citations] =>
+                    [text] => Here are some effective search strategies to find the latest developments in renewable energy:
+
+        ## General Search Terms
+        - "Renewable energy news 2025"
+        - ...
+                )
+
+        )
+        ```
+      </Step>
+    </Steps>
+  </Tab>
+
+  <Tab title="Ruby">
+    <Steps>
+      <Step title="Set your API key">
+        Export your API key as an environment variable. The SDK reads `ANTHROPIC_API_KEY` automatically.
+
+        ```bash
+        export ANTHROPIC_API_KEY="your-api-key-here"
+        ```
+      </Step>
+
+      <Step title="Create a project and install the SDK">
+        ```bash
+        mkdir claude-quickstart && cd claude-quickstart
+        bundle init
+        bundle add anthropic
+        ```
+      </Step>
+
+      <Step title="Create your code">
+        Create a file called `quickstart.rb`:
+
+        ```ruby Ruby
+        require "anthropic"
+
+        client = Anthropic::Client.new
+
+        message = client.messages.create(
+          model: Anthropic::Model::CLAUDE_OPUS_4_8,
+          max_tokens: 1000,
+          messages: [
+            {
+              role: "user",
+              content: "What should I search for to find the latest developments in renewable energy?"
+            }
+          ]
+        )
+
+        pp message.content
+        ```
+      </Step>
+
+      <Step title="Run your code">
+        ```bash
+        bundle exec ruby quickstart.rb
+        ```
+
+        ```text Output
+        [#<Anthropic::Models::TextBlock:0xc8 {text: "Here are some effective search strategies to find the latest developments in renewable energy:\n\n## General Search Terms\n- \"Renewable energy news 2025\"\n- ...", type: :text}>]
         ```
       </Step>
     </Steps>