Anthropic
claude-opus-4-1-0 model retirement
Stopped workingSubscribe to AnthropicShare
Calls to model claude-opus-4-1-0 fail since August 5, 2026. The model was deprecated on June 5, 2026, and is now retired. Any requests specifying this model identifier are no longer served.
The error you get
What Anthropic answers a call to claude-opus-4-1-0 once the model is gone, as recorded from real responses:
{"type":"error","error":{"type":"not_found_error","message":"model: claude-opus-4-1-0"}}What to use instead of claude-opus-4-1-0
Move to claude-opus-4-8, which is recommended by Anthropic.
In Anthropic's words
API model name: claude-opus-4-1-20250805; Current state: Retired; Deprecated: June 5, 2026; Tentative retirement date: August 5, 2026
Facts
- API
- Anthropic
api.anthropic.com - Model
claude-opus-4-1-0- Kind
- Model retirement
- Announced
- June 5, 2026
- Takes effect
- August 5, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Anthropic's own pages
Questions
When does claude-opus-4-1-0 shut down?
Calls to the model claude-opus-4-1-0 on Anthropic stopped working on August 5, 2026.
What happens to calls after August 5, 2026?
They have failed since August 5, 2026.
What error does claude-opus-4-1-0 return once it is shut down?
Anthropic answers HTTP 404: "model: claude-opus-4-1-0". Send another model to fix it.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.