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Claude 3.5 Sonnet vs Mistral Small 3.1

2 vs 0 benchmarks won

Anthropic
Claude 3.5 Sonnet
Mistral
Mistral Small 3.1
Overview
CompanyAnthropicMistral
Release dateJun 20 2024Mar 17 2025
Model type
Open sourceNoYes
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
59.4%
Software engineering
SWE-Bench Verified
33.4%
Multimodal understanding
MMMU
Timeline
Release gapClaude 3.5 Sonnet shipped 270 days before Mistral Small 3.1

Which is better: Claude 3.5 Sonnet or Mistral Small 3.1?

Claude 3.5 Sonnet leads Mistral Small 3.1 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude 3.5 Sonnet shipped 270 days before Mistral Small 3.1, so benchmark comparisons should account for the intervening progress.

Mistral Small 3.1 is an open-source / open-weight model; Claude 3.5 Sonnet 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 3.5 Sonnet released?
Claude 3.5 Sonnet was released by Anthropic on Jun 20 2024.
When was Mistral Small 3.1 released?
Mistral Small 3.1 was released by Mistral on Mar 17 2025.
Is Claude 3.5 Sonnet or Mistral Small 3.1 open source?
Mistral Small 3.1 is an open-source / open-weight model released by Mistral. Claude 3.5 Sonnet is a proprietary model released by Anthropic.

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