Claude Opus 4.1 is retired on the Claude API
DeprecationVerifiedAdded Sep 22, 2026
All requests to claude-opus-4-1-20250805 now return an error. Anthropic recommends upgrading to Claude Opus 5; researchers can request continued access through the External Researcher Access Program.
Topics: LLMs, Developer tools
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More Claude Platform releases
Every Claude Platform release| Date | Release | Type |
|---|---|---|
| Aug 5 | Inference hooks Beta | Beta |
| Aug 7 | Claude Managed Agents sessions support hard spend budgets Pricing | Pricing |
| Aug 7 | Claude Managed Agents sessions can consult an advisor model Update | Update |
| Aug 7 | Claude Managed Agents adds inference_geo to control where inference runs Update | Update |
| Aug 7 | Claude Managed Agents sessions load skills from GitHub repositories Update | Update |
| Aug 3 | Compliance API returns cloud Cowork session transcripts in beta Beta | Beta |
| Aug 1 | Dreams research preview adds support for Claude Opus 5 Preview | Preview |
| Aug 10 | Claude Sonnet 5 introductory pricing of $2 / $10 per MTok becomes permanent Pricing | Pricing |
