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Claude Sonnet 4 vs Mistral Small 3.1

2 vs 0 benchmarks won

Anthropic
Claude Sonnet 4
Mistral
Mistral Small 3.1
Overview
CompanyAnthropicMistral
Release dateMay 22 2025Mar 17 2025
Model type
Open sourceNoYes
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
75.4%
Software engineering
SWE-Bench Verified
72.7%
Multimodal understanding
MMMU
Timeline
Release gapMistral Small 3.1 shipped 66 days before Claude Sonnet 4

Which is better: Claude Sonnet 4 or Mistral Small 3.1?

Claude Sonnet 4 leads Mistral Small 3.1 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Mistral Small 3.1 shipped 66 days before Claude Sonnet 4, so benchmark comparisons should account for the intervening progress.

Mistral Small 3.1 is an open-source / open-weight model; Claude Sonnet 4 is proprietary.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Claude Sonnet 4 released?
Claude Sonnet 4 was released by Anthropic on May 22 2025.
When was Mistral Small 3.1 released?
Mistral Small 3.1 was released by Mistral on Mar 17 2025.
Is Claude Sonnet 4 or Mistral Small 3.1 open source?
Mistral Small 3.1 is an open-source / open-weight model released by Mistral. Claude Sonnet 4 is a proprietary model released by Anthropic.

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