Anthropic
claude-3-5-sonnet model retirement
Stopped workingSubscribe to AnthropicShare
Calls to the model claude-3-5-sonnet on Anthropic stopped working on October 28, 2025.
The error you get
What Anthropic answers a call to claude-3-5-sonnet once the model is gone, as recorded from real responses:
{"type":"error","error":{"type":"not_found_error","message":"model: claude-3-5-sonnet"}}What to use instead of claude-3-5-sonnet
Move to claude-sonnet-5-5, recommended by Anthropic.
In Anthropic's words
Retirement date: October 28, 2025; Deprecated model: claude-3-5-sonnet-20240620; Recommended replacement: claude-sonnet-5-5
Facts
- API
- Anthropic
api.anthropic.com - Model
claude-3-5-sonnet- Kind
- Model retirement
- Takes effect
- October 28, 2025
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Anthropic's own pages
Questions
When does claude-3-5-sonnet shut down?
Calls to the model claude-3-5-sonnet on Anthropic stopped working on October 28, 2025.
What happens to calls after October 28, 2025?
They have failed since October 28, 2025.
What error does claude-3-5-sonnet return once it is shut down?
Anthropic answers HTTP 404: "model: claude-3-5-sonnet". 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.
claude-3-5-sonnet on other APIs 1
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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.