Anthropic
claude-sonnet-4-latest model retirement
Stopped workingSubscribe to AnthropicShare
Calls targeting the model claude-sonnet-4-latest fail since June 15, 2026. Anthropic deprecated the model on April 14, 2026, before reaching its retirement date. Requests sent with this model identifier no longer succeed.
The error you get
What Anthropic answers a call to claude-sonnet-4-latest once the model is gone, as recorded from real responses:
{"type":"error","error":{"type":"not_found_error","message":"model: claude-sonnet-4-latest"}}What to use instead of claude-sonnet-4-latest
Move to claude-sonnet-5-5, which is recommended by Anthropic.
In Anthropic's words
API model name: claude-sonnet-4-20250514; Current state: Retired; Deprecated: April 14, 2026; Tentative retirement date: June 15, 2026
Facts
- API
- Anthropic
api.anthropic.com - Model
claude-sonnet-4-latest- 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-sonnet-4-latest shut down?
Calls to the model claude-sonnet-4-latest 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-sonnet-4-latest return once it is shut down?
Anthropic answers HTTP 404: "model: claude-sonnet-4-latest". 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.