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api/versioning.md

Changed on 2026-06-08 16:07:07 EST

+5 lines added
-5 lines removed
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# Versions¶

When making API requests, you must send an `anthropic-version` request header. For example, `anthropic-version: 2023-06-01`. If you are using ourthe [client SDKs](/docs/en/api/client-sdkscli-sdks-libraries/overview), this is handled for you automatically.¶

---¶

For any given version with the Messages API, we willAnthropic preserves:¶

* Existing input parameters¶
* Existing output parameters¶

However, weAnthropic may do the following:¶

* Add additional optional inputs¶
* Add additional values to the output¶
* Change conditions for specific error types¶
* Add new variants to enum-like output values (for example, streaming event types)¶

Generally, if you are using the API as documented in this reference, weAnthropic will not break your usage.¶

## Version history¶

We alwaysAnthropic recommends using the latest API version whenever possible. Previous versions are considered deprecated and may be unavailable for new users.¶

* `2023-06-01`¶
* New format for [streaming](/docs/en/build-with-claude/streaming) server-sent events (SSE):¶
* Completions are incremental. For example, `" Hello"`, `" my"`, `" name"`, `" is"`, `" Claude." ` instead of `" Hello"`, `" Hello my"`, `" Hello my name"`, `" Hello my name is"`, `" Hello my name is Claude."`.¶
* All events are [named events](https://developer.mozilla.org/en-US/Web/API/Server-sent%5Fevents/Using%5Fserver-sent%5Fevents#named%5Fevents), rather than [data-only events](https://developer.mozilla.org/en-US/Web/API/Server-sent%5Fevents/Using%5Fserver-sent%5Fevents#data-only%5Fmessages).¶
* Removed unnecessary `data: [DONE]` event.¶
* Removed legacy `exception` and `truncated` values in responses.¶
* `2023-01-01`: Initial release.

Unified Diff

--- a/api/versioning.md
+++ b/api/versioning.md
@@ -1,26 +1,26 @@
 # Versions
 
-When making API requests, you must send an `anthropic-version` request header. For example, `anthropic-version: 2023-06-01`. If you are using our [client SDKs](/docs/en/api/client-sdks), this is handled for you automatically.
+When making API requests, you must send an `anthropic-version` request header. For example, `anthropic-version: 2023-06-01`. If you are using the [client SDKs](/docs/en/cli-sdks-libraries/overview), this is handled for you automatically.
 
 ---
 
-For any given version with the Messages API, we will preserve:
+For any given version with the Messages API, Anthropic preserves:
 
 * Existing input parameters
 * Existing output parameters
 
-However, we may do the following:
+However, Anthropic may do the following:
 
 * Add additional optional inputs
 * Add additional values to the output
 * Change conditions for specific error types
 * Add new variants to enum-like output values (for example, streaming event types)
 
-Generally, if you are using the API as documented in this reference, we will not break your usage.
+Generally, if you are using the API as documented in this reference, Anthropic will not break your usage.
 
 ## Version history
 
-We always recommend using the latest API version whenever possible. Previous versions are considered deprecated and may be unavailable for new users.
+Anthropic recommends using the latest API version whenever possible. Previous versions are considered deprecated and may be unavailable for new users.
 
 * `2023-06-01`
    * New format for [streaming](/docs/en/build-with-claude/streaming) server-sent events (SSE):