Magistral Small 1.2
Magistral Small 1.2 is a 24B reasoning model built on Mistral Small 3.2. Mistral trained it with supervised examples from Magistral Medium, followed by reinforcement learning. Its Apache 2.0 weights remain available, while its API is deprecated.
Deprecated API; check access details
Use the reasoning format and context guidance
The September 2025 version adds a vision encoder and dedicated tokens that separate reasoning from the final reply. The card advertises 128k context but warns that performance may decline beyond 40k. It recommends retaining the larger limit unless poor results require a reduction.Magistral Small 1.2 official weight card
Separate the deprecated API from weights
The model page records API deprecation on 30 April 2026. The official weight repository remains available. API access is subject to Mistral's retirement schedule; a published model identifier does not guarantee continued service after retirement.Magistral Small 1.2 API lifecycle pageMagistral Small 1.2 official weight card
Evaluate the complete task
Practical guidance. A long reasoning response is not evidence that an answer is correct. Evaluate final answers and their supporting calculations. For image problems, check whether the model read the source values correctly before assessing the reasoning. Compare longer contexts against shorter, focused inputs.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Deprecated API; check access details |
| Access | API, Downloadable |
| Model identifiers | magistral-small-2509Magistral-Small-2509 |
| Context window | 128,000 tokens Advertised 128k context. The card warns of possible degradation beyond 40k. Magistral Small 1.2 official weight card |
| API status | Deprecated on 30 April 2026Magistral Small 1.2 API lifecycle page |
| Weight license | Apache 2.0Magistral Small 1.2 official weight card |
| Weight repository | mistralai/Magistral-Small-2509Magistral Small 1.2 official weight card |
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