Agent Breaking Changes_

← Model deprecations

Anthropic Deprecations page changed: Anthropic

2026-10-22 · official page

Summary

• -Legacy: The model will no longer receive updates and may be deprecated in the future.
• +Legacy: The model will no longer receive updates and might be deprecated in the future.
• -Retired: The model is no longer available for use. Requests to retired models will fail.
• +Retired: The model is no longer available for use. Requests to retired models fail.
• -For specific instructions on migrating to the latest Claude models, see the Migration guide .

Full notes

-Legacy: The model will no longer receive updates and may be deprecated in the future.
+Legacy: The model will no longer receive updates and might be deprecated in the future.
-Retired: The model is no longer available for use. Requests to retired models will fail.
+Retired: The model is no longer available for use. Requests to retired models fail.
-For specific instructions on migrating to the latest Claude models, see the Migration guide .
+For specific instructions on migrating to the latest Claude models, see Migration guides .
-To help identify usage of deprecated models, customers can access an audit of their API usage. Follow these steps:
+To help identify usage of deprecated models, you can access an audit of your API usage. Follow these steps:
-This audit will help you locate any instances where your application is still using deprecated models, allowing you to prioritize updates to newer models before the retirement date.
+This audit helps you locate any instances where your application is still using deprecated models, allowing you to prioritize updates to newer models before the retirement date.
-Contact the support team if you need assistance with migration or have any questions.
+Contact the support team if you need help with migration or have any questions.
-On February 19, 2026, Anthropic notified developers using Claude Haiku 3 model of its upcoming retirement on the Claude API.
+On February 19, 2026, Anthropic notified developers using Claude Haiku 3 of its upcoming retirement on the Claude API.
-On December 19, 2025, Anthropic notified developers using Claude Haiku 3.5 model of its upcoming retirement on the Claude API.
+On December 19, 2025, Anthropic notified developers using Claude Haiku 3.5 of its upcoming retirement on the Claude API.
-On October 28, 2025, Anthropic notified developers using Claude Sonnet 3.7 model of its upcoming retirement on the Claude API.
+On October 28, 2025, Anthropic notified developers using Claude Sonnet 3.7 of its upcoming retirement on the Claude API.
-On June 30, 2025, Anthropic notified developers using Claude Opus 3 model of its upcoming retirement.
+On June 30, 2025, Anthropic notified developers using Claude Opus 3 of its upcoming retirement.
-Anthropic occasionally deprecates request parameters that no longer apply to current models. How the API treats a deprecated parameter depends on the model, as the following table shows. Most SDKs keep deprecated parameters in their request types so existing code continues to type-check. The Python SDK (v1.0 and later) removes temperature , top_p , and top_k , so passing them raises a TypeError .
+Anthropic occasionally deprecates request parameters that no longer apply to current models. A new model can reject a deprecated parameter, and a new API version can remove it for every model.
-temperature , top_p , top_k Deprecated (Claude 4.7 and later models) Returns a 400 error when set to a non-default value on Claude 4.7 and later models and Claude Mythos Preview . Omit and use prompting to guide model behavior.
-For migration steps, see the migration guide .
+temperature , top_p , top_k Removed in API version 2026-10-21 Returns a 400 error . Earlier API versions return it when set to a non-default value on Claude 4.7 and later models and Claude Mythos Preview . Omit and use prompting to guide model behavior.
+For migration steps, see Migration guides .