# labs-leanstral-2603

Calls to the model labs-leanstral-2603 on Mistral stopped working on June 30, 2026.

On June 30, 2026, the model labs-leanstral-2603 was retired. Calls specifying model labs-leanstral-2603 fail since that date.

## The error Mistral returns once labs-leanstral-2603 is gone

HTTP 400

```json
{"object":"error","message":"Invalid model: labs-leanstral-2603","type":"invalid_model","param":null,"code":"1500"}
```

## What to use instead

Mistral recommends migrating to Leanstral 1.5.

- 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
- Calls it hits: `model labs-leanstral-2603`
- Source: [Lifecycle page](https://docs.mistral.ai/getting-started/models/models_overview/)
- Verified: November 6, 2026, against Mistral's own pages
- Page: https://www.okapi.bot/models/mistral/labs-leanstral-2603/

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent