Observed source change · Anthropic
Claude model deprecations documentation changed
Published documentation; runtime behavior and legal interpretation not established.
Last unchanged check: 2026-10-21T18:50:10Z
First changed check: 2026-10-21T20:55:11Z
Before
* **Legacy:** The model will no longer receive updates and may be deprecated in the future. * **Retired:** The model is no longer available for use. Requests to retired models will fail. For specific instructions on migrating to the latest Claude models, see the [Migration guide](https://platform.claude.com/docs/en/about-claude/models/migration-guide). To help identify usage of deprecated models, customers can access an audit of their 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 …
After
* **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 fail. For specific instructions on migrating to the latest Claude models, see [Migration guides](https://platform.claude.com/docs/en/about-claude/models/migration-guide). To help identify usage of deprecated models, you can access an audit of your API usage. Follow these steps: 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. …
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