Mistral
labs-leanstral-2603 model retirement
Stopped workingSubscribe to MistralShare
On June 30, 2026, the model labs-leanstral-2603 was retired. Calls specifying model labs-leanstral-2603 fail since that date.
The error you get
What Mistral answers a call to labs-leanstral-2603 once the model is gone, as recorded from real responses:
{"object":"error","message":"Invalid model: labs-leanstral-2603","type":"invalid_model","param":null,"code":"1500"}What to use instead of labs-leanstral-2603
Mistral recommends migrating to Leanstral 1.5.
Facts
- API
- Mistral
api.mistral.ai - Model
labs-leanstral-2603- Kind
- Model retirement
- Announced
- May 22, 2026
- Takes effect
- June 30, 2026
- Calls after that day
- Fail
- Source
- Lifecycle page
- Last updated
- Verified
- , against Mistral's own pages
Questions
When does labs-leanstral-2603 shut down?
Calls to the model labs-leanstral-2603 on Mistral stopped working on June 30, 2026.
What happens to calls after June 30, 2026?
They have failed since June 30, 2026.
What error does labs-leanstral-2603 return once it is shut down?
Mistral answers HTTP 400: "Invalid model: labs-leanstral-2603". 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.