Anthropic
claude-opus-4-0 model retirement
Stopped workingSubscribe to AnthropicShare
On June 15, 2026, the model claude-opus-4-0 was retired. Calls specifying this model fail since that date. Anthropic announced the deprecation on April 14, 2026.
The error you get
What Anthropic answers a call to claude-opus-4-0 once the model is gone, as recorded from real responses:
{"type":"error","error":{"type":"not_found_error","message":"model: claude-opus-4-0"}}What to use instead of claude-opus-4-0
Move to claude-opus-4-8, which is recommended by Anthropic.
In Anthropic's words
API model name: claude-opus-4-20250514; Current state: Retired; Deprecated: April 14, 2026; Tentative retirement date: June 15, 2026
Facts
- API
- Anthropic
api.anthropic.com - Model
claude-opus-4-0- Kind
- Model retirement
- Announced
- April 14, 2026
- Takes effect
- June 15, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Anthropic's own pages
Questions
When does claude-opus-4-0 shut down?
Calls to the model claude-opus-4-0 on Anthropic stopped working on June 15, 2026.
What happens to calls after June 15, 2026?
They have failed since June 15, 2026.
What error does claude-opus-4-0 return once it is shut down?
Anthropic answers HTTP 404: "model: claude-opus-4-0". 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.