Composer 2.5 vs Devstral 2 (123B)
Cursor Composer 2.5 | Mistral Devstral 2 (123B) | |
|---|---|---|
| Overview | ||
| Company | Cursor | Mistral |
| Release date | May 18 2026 | Dec 9 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
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. | 79.8% | — |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 63.2% | — |
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. | 92% | — |
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. | 69.3% | — |
| Timeline | ||
| Release gap | Devstral 2 (123B) shipped 160 days before Composer 2.5 | |
Which is better: Composer 2.5 or Devstral 2 (123B)?
Composer 2.5 and Devstral 2 (123B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Devstral 2 (123B) shipped 160 days before Composer 2.5, so benchmark comparisons should account for the intervening progress.
Composer 2.5 is proprietary, while Devstral 2 (123B) is open weight.
Direct benchmark comparisons are unavailable — Composer 2.5 and Devstral 2 (123B) don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer 2.5 was released by Cursor on May 18 2026.
Devstral 2 (123B) was released by Mistral on Dec 9 2025.
Composer 2.5 is a proprietary model released by Cursor. Devstral 2 (123B) is an open weight model released by Mistral.
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