Fall Deprecations and Migration Plan
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At Mistral, a model goes through three states: available, deprecated—it still responds until its retirement date—and then retired—it no longer responds and you must use its replacement. Fall 2026 shifted a significant portion of the summer lineup. This lesson compiles the dates from the official model table and proposes a migration plan.
What has reached its retirement date
| Model | Identifier | Retirement | Suggested Replacement |
|---|---|---|---|
| Devstral Small 2 | labs-devstral-small-2512 | March 31, 2026 | Mistral Medium 3.5 |
| Mistral Small 3.2 | mistral-small-2506 | July 31, 2026 | Mistral Small 4 |
| Devstral 2 | devstral-2512 | July 31, 2026 | Mistral Medium 3.5 |
| Magistral Medium 1.2 and Small 1.2 | magistral-medium-2509, magistral-small-2509 | July 31, 2026 | Medium 3.5, Small 4 |
| Mistral Nemo 12B | open-mistral-nemo-2407 | July 31, 2026 | Ministral 3 8B |
| Mistral Medium 3 and 3.1 | mistral-medium-2505, mistral-medium-2508 | August 31, 2026 | Mistral Medium 3.5 |
| OCR 4.0 | mistral-ocr-4-0 | September 30, 2026 | OCR 4.1 |
The official table may still show some of these models with the status “Deprecated”; since their retirement date has passed, do not rely on them. Another point deserves your attention: several suggested replacements for models retired in spring and summer—Mistral Medium 3.5 chief among them—are themselves deprecated as of October 31. If you are migrating today from Devstral 2 or Magistral Medium, aim directly for the next-generation replacement rather than the intermediate step.
What has been deprecated since October 31, 2026
| Model | Identifier | Planned Retirement | Suggested Replacement |
|---|---|---|---|
| Mistral Medium 3.5 | mistral-medium-3-5 | April 30, 2027 | Mistral Large 4 |
| Mistral Large 3 | mistral-large-2512 | April 30, 2027 | Mistral Large 4 |
| Voxtral TTS | voxtral-mini-tts-2603 | April 30, 2027 | Voxtral TTS 3 |
| Voxtral Mini Transcribe 2 | voxtral-mini-2602 | April 30, 2027 | Voxtral Mini Transcribe 3 |
| Voxtral Mini Transcribe Realtime | voxtral-mini-transcribe-realtime-2602 | April 30, 2027 | Voxtral Mini Transcribe Realtime 3 |
The Large 4 and Voxtral 3 replacements are, as of this date, in public preview. You therefore have six months to compare, and it’s reasonable to wait for their general availability before switching a critical service.
The migration plan
1. Inventory. Search your code, environment variables, and configurations for the identifiers mistral-, magistral-, devstral-, voxtral-, and codestral-. Don’t forget the -latest aliases: they designate a family, and the model table tells you where they point today.
2. Handle what is already retired first. A call to a retired model fails: this is an outage, not debt. OCR 4.0, Devstral 2, Magistral 1.2, and Medium 3.1 are the most frequent cases in code written in 2026.
3. Plan for what is deprecated. For Medium 3.5, Large 3, and the 2026 audio models, prepare an evaluation campaign on Large 4 and Voxtral 3, then switch before April 30, 2027.
4. Update Vibe usage. On the user side, the migration is of a different nature: rename Le Chat to Vibe in your materials and adopt the function equivalencies presented in Lesson 9.
5. Monitor. Bookmark the model table and the changelog in a monthly review: between the announcement of a deprecation and retirement, Mistral sometimes leaves barely a month, and only one day for OCR 4.0, whose replacement was, admittedly, already in place at the same price.
Key takeaways
- Already retired: Devstral 2, Magistral 1.2, Medium 3 and 3.1, Small 3.2, Mistral Nemo, and OCR 4.0
- Deprecated October 31, 2026, retired April 30, 2027: Medium 3.5, Large 3, and the 2026 audio models
- Replacements: Mistral Large 4 and Voxtral 3, still in public preview
- A call to a retired model fails: start there
Test your knowledge
1. What happened on May 28, 2026 on the consumer product side?
Response: Mistral announced that Le Chat was becoming Vibe, a single agent for work and code, with conversations, settings, and subscriptions carried over. The old experience remains accessible in Chat mode.
2. Your code calls `mistral-medium-3-5`: is it down?
Response: Not yet. Medium 3.5 has been deprecated since October 31, 2026 but responds until April 30, 2027. Its designated replacement is Mistral Large 4, in public preview.
3. What if it calls `mistral-ocr-4-0`?
Response: Yes: OCR 4.0 is retired as of September 30, 2026. Switch to mistral-ocr-4-1, or to the alias mistral-ocr-latest, which points to OCR 4.1, at the same price.
4. Where do you find Le Chat agents and memories in Vibe?
Response: Agents correspond to skills, invoked with @, and memories to the knowledge base in Work mode. Advanced search has become the Deep Research skill.
5. Under what license are Mistral Large 4 weights published?
Response: Under the Mistral Ecosystem Open Weight License, not Apache 2.0: read it before any commercial self-hosted deployment.