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Step 5 Preview
Devstral 2
Devstral 2 is an open-weight model from Mistral AI, released Dec 9, 2025. Its best result is #116 of 143 on LiveCodeBench with 51.84%. It costs $0.40 per million input tokens and $2 per million output tokens, with a 256K-token context window.
- Developer
- Mistral AI
- Released
- Dec 9, 2025
- Context window
- 256K
- Price in / out, per 1M tokens
- $0.40 / $2
- Weights
- Open · Modified MIT
- Inputs
- Text, Files
- Reasoning
- No
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 5.4K
- Hugging Face likes
- 356
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| SWE-benchCoding | 62.80% | 73 / 85 | $0.75 | |
| LiveCodeBenchCoding | 51.84% | 116 / 143 | $0.4 / $2 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| WebDevLMArena | 1197 | 145 / 124 | 1.2K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Devstral 2
Mistral AI
Europe’s leading model lab, with efficient open and commercial models and EU hosting. Founded 2023, based in Paris. mistral.ai
Questions
Who makes Devstral 2?
Devstral 2 is made by Mistral AI, founded 2023 and based in Paris.
How much does Devstral 2 cost?
$0.40 per million input tokens and $2 per million output tokens, at its provider’s list price.
What is Devstral 2’s context window?
256K tokens (262,144).
Is Devstral 2 open source?
Devstral 2 has open weights under the Modified MIT license, downloadable from Hugging Face (mistralai/Devstral-2-123B-Instruct-2512).