Deprecations

# Anthropic — deprecations # source: https://platform.claude.com/docs/en/about-claude/model-deprecations # archived by saidwhen.org — git history is the record; see `git log -p` on this file # --- This page lists all API deprecations, along with recommended replacements. Overview Anthropic uses the following terms to describe the model lifecycle: - Active: The model is fully supported and recommended for use. - Legacy: The model will no longer receive updates and might be deprecated in the future. - Deprecated: The model is still functional but no longer recommended. Anthropic provides a recommended replacement and assigns a retirement date. - Retired: The model is no longer available for use. Requests to retired models fail. Deprecated models are likely to be less reliable than active models. Move workloads to active models to maintain the highest level of support and reliability. The dates on this page apply to Anthropic-operated platforms: the Claude API, Claude Platform on AWS , Claude Models on Google Cloud (Anthropic managed) , and Microsoft Foundry . Partner-operated platforms, Claude Models on Google Cloud (Google managed) and Amazon Bedrock, set their own retirement schedules, so a model’s lifecycle status and dates can differ. See the Amazon Bedrock , Amazon Bedrock (Opus 4.6 and earlier) , and Claude Models on Google Cloud (Google managed) model tables. Migrating to replacements Once a model is deprecated, migrate all usage to a suitable replacement before the retirement date. Requests to models past the retirement date will fail. To help measure the performance of replacement models on your tasks, consider thorough testing of your applications with the new models well before the retirement date. For specific instructions on migrating to the latest Claude models, see Migration guides . Notifications Anthropic notifies customers with active deployments for models with upcoming retirements, providing at least 60 days’ notice before model retirement for publicly released models. Auditing model usage To help identify usage of deprecated models, you can access an audit of your API usage. Follow these steps: - Go to the Usage page in Claude Console. - Click Export . - Review the downloaded CSV to see usage broken down by API key and model. 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. Best practices - Regularly check the documentation for updates on model deprecations. - Test your applications with newer models well before the retirement date of your current model. - Update your code to use the recommended replacement model as soon as possible. - Contact the support team if you need help with migration or have any questions. Deprecation downsides and mitigations Anthropic currently deprecates and retires models to ensure capacity for new model releases. This comes with downsides: - Users who value specific models must migrate to new versions. - Researchers lose access to models for ongoing and comparative studies. - Model retirement introduces safety- and model welfare-related risks. At some point, Anthropic hopes to make past models publicly available again. In the meantime, Anthropic has committed to long-term preservation of model weights and other measures to help mitigate these impacts. For more details, see Commitments on Model Deprecation and Preservation . Model status Current and recently retired models are listed in the following table with their status: API model name Current state Deprecated Tentative retirement date claude-fable-5-2 Active N/A Not sooner than November 9, 2027 claude-mythos-5-2 Active N/A Not sooner than November 9, 2027 claude-fable-5-1 Active N/A Not sooner than September 1, 2027 claude-mythos-5-1 Active N/A Not sooner than September 1, 2027 claude-fable-5 Active N/A Not sooner than June 9, 2027 claude-mythos-5 Active N/A Not sooner than June 9, 2027 claude-mythos-preview Deprecated June 9, 2026 To be announced claude-opus-5-5 Active N/A Not sooner than September 22, 2027 claude-opus-5 Active N/A Not sooner than July 24, 2027 claude-opus-4-8 Active N/A Not sooner than May 28, 2027 claude-opus-4-7 Active N/A Not sooner than April 16, 2027 claude-opus-4-6 Active N/A Not sooner than February 5, 2027 claude-opus-4-5-20251101 Active N/A Not sooner than November 24, 2026 claude-opus-4-1-20250805 Retired June 5, 2026 August 5, 2026 claude-opus-4-20250514 Retired April 14, 2026 June 15, 2026 claude-sonnet-5-5 Active N/A Not sooner than September 28, 2027 claude-sonnet-5 Active N/A Not sooner than June 30, 2027 claude-sonnet-4-6 Active N/A Not sooner than February 17, 2027 claude-sonnet-4-5-20250929 Deprecated September 30, 2026 November 30, 2026 claude-sonnet-4-20250514 Retired April 14, 2026 June 15, 2026 claude-3-7-sonnet-20250219 Retired October 28, 2025 February 19, 2026 claude-haiku-5-5 Active N/A Not sooner than October 7, 2027 claude-haiku-4-5-20251001 Active N/A Not sooner than October 15, 2026 claude-3-5-haiku-20241022 Retired December 19, 2025 February 19, 2026 claude-3-haiku-20240307 Retired February 19, 2026 April 20, 2026 Deprecation history All deprecations are listed in the following sections, with the most recent announcements first. 2026-09-30: Claude Sonnet 4.5 model On September 30, 2026, Anthropic notified developers using Claude Sonnet 4.5 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement November 30, 2026 claude-sonnet-4-5-20250929 claude-sonnet-5-5 2026-06-05: Claude Opus 4.1 model This model was retired August 5, 2026. On June 5, 2026, Anthropic notified developers using Claude Opus 4.1 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement August 5, 2026 claude-opus-4-1-20250805 claude-opus-4-8 2026-04-14: Claude Sonnet 4 and Claude Opus 4 models These models were retired June 15, 2026. On April 14, 2026, Anthropic notified developers using Claude Sonnet 4 and Claude Opus 4 models of their upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement June 15, 2026 claude-sonnet-4-20250514 claude-sonnet-5-5 June 15, 2026 claude-opus-4-20250514 claude-opus-4-8 2026-02-19: Claude Haiku 3 model This model was retired April 20, 2026. On February 19, 2026, Anthropic notified developers using Claude Haiku 3 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement April 20, 2026 claude-3-haiku-20240307 claude-haiku-4-5-20251001 2025-12-19: Claude Haiku 3.5 model This model was retired February 19, 2026. On December 19, 2025, Anthropic notified developers using Claude Haiku 3.5 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement February 19, 2026 claude-3-5-haiku-20241022 claude-haiku-4-5-20251001 2025-10-28: Claude Sonnet 3.7 model This model was retired February 19, 2026. On October 28, 2025, Anthropic notified developers using Claude Sonnet 3.7 of its upcoming retirement on the Claude API. Retirement date Deprecated model Recommended replacement February 19, 2026 claude-3-7-sonnet-20250219 claude-sonnet-5-5 2025-08-13: Claude Sonnet 3.5 models These models were retired October 28, 2025. On August 13, 2025, Anthropic notified developers using Claude Sonnet 3.5 models of their upcoming retirement. Retirement date Deprecated model Recommended replacement October 28, 2025 claude-3-5-sonnet-20240620 claude-sonnet-5-5 October 28, 2025 claude-3-5-sonnet-20241022 claude-sonnet-5-5 2025-06-30: Claude Opus 3 model This model was retired January 5, 2026. On June 30, 2025, Anthropic notified developers using Claude Opus 3 of its upcoming retirement. Retirement date Deprecated model Recommended replacement January 5, 2026 claude-3-opus-20240229 claude-opus-4-8 2025-01-21: Claude 2, Claude 2.1, and Claude Sonnet 3 models These models were retired July 21, 2025. On January 21, 2025, Anthropic notified developers using Claude 2, Claude 2.1, and Claude Sonnet 3 models of their upcoming retirements. Retirement date Deprecated model Recommended replacement July 21, 2025 claude-2.0 claude-opus-4-8 July 21, 2025 claude-2.1 claude-opus-4-8 July 21, 2025 claude-3-sonnet-20240229 claude-sonnet-5-5 2024-09-04: Claude 1 and Instant models These models were retired November 6, 2024. On September 4, 2024, Anthropic notified developers using Claude 1 and Instant models of their upcoming retirements. Retirement date Deprecated model Recommended replacement November 6, 2024 claude-1.0 claude-haiku-4-5-20251001 November 6, 2024 claude-1.1 claude-haiku-4-5-20251001 November 6, 2024 claude-1.2 claude-haiku-4-5-20251001 November 6, 2024 claude-1.3 claude-haiku-4-5-20251001 November 6, 2024 claude-instant-1.0 claude-haiku-4-5-20251001 November 6, 2024 claude-instant-1.1 claude-haiku-4-5-20251001 November 6, 2024 claude-instant-1.2 claude-haiku-4-5-20251001 API parameter deprecations 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. Parameter Status Behavior Recommended replacement 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 .