Mistral AI · model
magistral-small-2509 deprecation: shutdown date & replacement
Shut down July 31, 2026
- Provider
- Mistral AI
- Name
- Magistral Small 1.2
- Type
- model
- Announced
- Shutdown
- Replacement
Mistral Small 4- Source
- Official Mistral AI notice
'announced' is the deprecation date from the table. Replacement is given as a display name (API id not stated in the table).
How to migrate off magistral-small-2509
- Find every place that references it:
grep -rn --exclude-dir={node_modules,.git,dist} "magistral-small-2509" . - Replace the model ID:
- model: "magistral-small-2509" + model: "Mistral Small 4" - Re-run your evals or a sample of real prompts — output style, token usage and pricing can change between models.
- Check config outside code too: environment variables, feature flags, prompt-management tools, and fine-tuned model references.
- Deploy before July 31, 2026, and add the CI scanner so it cannot come back.
Also shutting down on July 31, 2026 (Mistral AI)
Questions
Is magistral-small-2509 deprecated?
Yes. Mistral AI has deprecated magistral-small-2509. It was shut down on July 31, 2026.
When does magistral-small-2509 shut down?
July 31, 2026, according to Mistral AI's official deprecation notice.
What should I use instead of magistral-small-2509?
Mistral AI recommends Mistral Small 4. Switch the model ID and re-test your prompts, since outputs, pricing and limits can differ.
What happens to requests to magistral-small-2509 after the shutdown?
Requests using the retired model ID fail with an error, so any code still calling it breaks. Update and deploy before the shutdown date.