Mistral Medium 3.5vsComposer
Mistral Medium 3.5 | Composer | |
|---|---|---|
| Specifications | ||
Parameters | 128B | — |
Context window | 256k | — |
| Benchmarks | ||
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 77.6% | — |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1267 | — |
| Overview | ||
| Company | Mistral | SpaceXAI |
| Release date | Apr 29 2026 | Oct 29 2025 |
| Access | Open Weight | Proprietary |
Which is better: Mistral Medium 3.5 or Composer?
Mistral Medium 3.5 and Composer don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Composer shipped 182 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Mistral Medium 3.5 is open weight, while Composer is proprietary.
Direct benchmark comparisons are unavailable — Mistral Medium 3.5 and Composer don't publish scores on any of the same benchmarks.
Frequently asked questions
Mistral Medium 3.5 was released by Mistral on Apr 29 2026.
Composer was released by SpaceXAI on Oct 29 2025.
Mistral Medium 3.5 is an open weight model released by Mistral. Composer is a proprietary model released by SpaceXAI.
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