Anthropic
claude-3-haiku-20240307 model retirement
Stopped workingSubscribe to AnthropicShare
On April 20, 2026, Anthropic retired the model claude-3-haiku-20240307 following its deprecation on February 19, 2026. Any requests specifying model claude-3-haiku-20240307 fail since that date.
The error you get
What Anthropic answers a call to claude-3-haiku-20240307 once the model is gone, as recorded from real responses:
{"type":"error","error":{"type":"not_found_error","message":"model: claude-3-haiku-20240307"}}What to use instead of claude-3-haiku-20240307
Move to claude-haiku-4-5-20251001, which is recommended by Anthropic.
In Anthropic's words
API model name: claude-3-haiku-20240307; Current state: Retired; Deprecated: February 19, 2026; Tentative retirement date: April 20, 2026
Facts
- API
- Anthropic
api.anthropic.com - Model
claude-3-haiku-20240307- Released
- March 13, 2024 (models.dev)
- Kind
- Model retirement
- Announced
- February 19, 2026
- Takes effect
- April 20, 2026
- Calls after that day
- Fail
- Source
- Deprecations page
- Last updated
- Verified
- , against Anthropic's own pages
Questions
When does claude-3-haiku-20240307 shut down?
Calls to the model claude-3-haiku-20240307 on Anthropic stopped working on April 20, 2026.
What happens to calls after April 20, 2026?
They have failed since April 20, 2026.
What error does claude-3-haiku-20240307 return once it is shut down?
Anthropic answers HTTP 404: "model: claude-3-haiku-20240307". Send another model to fix it.
When was claude-3-haiku-20240307 released?
claude-3-haiku-20240307 was released on March 13, 2024, according to models.dev.
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.
More from Anthropic 10
-
claude-3-haikuModel retirement Stopped working -
claude-3-haiku-latestModel retirement Stopped working -
claude-opus-4Model retirement Stopped working -
claude-opus-4-0Model retirement Stopped working -
claude-opus-4-20250514Model retirement Stopped working -
claude-opus-4-latestModel retirement Stopped working -
claude-sonnet-4Model retirement Stopped working -
claude-sonnet-4-0Model retirement Stopped working -
claude-sonnet-4-20250514Model retirement Stopped working -
claude-sonnet-4-latestModel retirement Stopped working
You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.