mistral-small-2506 model retirement
Stopped workingSubscribe to MistralShare
Requests specifying model mistral-small-2506 fail since July 31, 2026. Mistral announced the retirement on April 30, 2026, and permanently shut down the model on the effective date. Any API requests targeting mistral-small-2506 now return errors.
The error you get
What Mistral answers a call to mistral-small-2506 once the model is gone, as recorded from real responses:
{"object":"error","message":"Invalid model: mistral-small-2506","type":"invalid_model","param":null,"code":"1500"}What to use instead of mistral-small-2506
Mistral recommends migrating to Mistral Small 4.
Facts
- API
- Mistral
api.mistral.ai - Model
mistral-small-2506- Released
- June 20, 2025 (models.dev)
- Kind
- Model retirement
- Announced
- April 30, 2026
- Takes effect
- July 31, 2026
- Calls after that day
- Fail
- Source
- Lifecycle page
- Last updated
- Verified
- , against Mistral's own pages
Questions
When does mistral-small-2506 shut down?
Calls to the model mistral-small-2506 stopped working on July 31, 2026.
What happens to calls after July 31, 2026?
They have failed since July 31, 2026.
What error does mistral-small-2506 return once it is shut down?
Mistral answers HTTP 400: "Invalid model: mistral-small-2506". Send another model to fix it.
When was mistral-small-2506 released?
mistral-small-2506 was released on June 20, 2025, 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.
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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.