Mistral Medium 3.5vsComposer 2
Mistral Medium 3.5 | Composer 2 | |
|---|---|---|
| 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% | — |
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | — | 73.7% |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | — | 52.2% |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | — | 75% |
Agentic terminal coding Terminal-Bench 2.0Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | — | 61.7% |
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 | Mar 19 2026 |
| Access | Open Weight | Proprietary |
Which is better: Mistral Medium 3.5 or Composer 2?
Mistral Medium 3.5 and Composer 2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Composer 2 shipped 41 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Mistral Medium 3.5 is open weight, while Composer 2 is proprietary.
Direct benchmark comparisons are unavailable — Mistral Medium 3.5 and Composer 2 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 2 was released by SpaceXAI on Mar 19 2026.
Mistral Medium 3.5 is an open weight model released by Mistral. Composer 2 is a proprietary model released by SpaceXAI.
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