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Mistral AI: Devstral Small 2

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devstral-small-2

Devstral Small 2 is Mistral AI’s open-weights AI model, released Dec 9, 2025.

Context
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Input
— / 1M
Output
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Released
Dec 9, 2025
Modalities

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Devstral Small 2 lands among all models tracked on Model Beat.

2.0
Intelligence Index
Artificial Analysis
2nd percentile of tracked models
5.0
Coding Index
Artificial Analysis
5th percentile of tracked models
2.0
Agentic Index
Artificial Analysis
2nd percentile of tracked models

Reasoning

3 evals
GPQA Diamond53.2%

Graduate-level scientific reasoning

Humanity's Last Exam3.5%

Frontier of human expert knowledge

MMLU-Pro67.8%

Broad expert knowledge

Coding

2 evals
LiveCodeBench34.8%

Contamination-free coding

SciCode32.4%

Scientific research coding

Math

1 evals
AIME 2024/202534.3%

Olympiad-qualifier math

Agentic & Tools

1 evals
τ²-bench23.4%

Tool-agent-user reliability

Changelog

1
  • Devstral Small 2: reported SciCode score rose from 28.8% to 32.4% (+13%)benchmark · Sep 7, 2026

Compare Devstral Small 2 with

Devstral Small 2 vs GPT-6 AstraDevstral Small 2 vs Claude Fable 5Devstral Small 2 vs Kimi K3Devstral Small 2 vs Grok 4.6Devstral Small 2 vs DeepSeek-V4-Pro-0813

Frequently asked questions

What is Devstral Small 2?

Devstral Small 2 is an AI model, from Mistral AI, released Dec 9, 2025.

Who created Devstral Small 2?

Devstral Small 2 is an AI model developed by Mistral AI, released Dec 9, 2025.

How does Devstral Small 2 perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Devstral Small 2 scores 32.4% on SciCode, 53.2% on GPQA Diamond, 23.4% on τ²-bench.

Is Devstral Small 2 open source?

Devstral Small 2 is released with open weights (Open weights (unrestricted)), so the model can be downloaded and self-hosted.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Sep 4, 2026.