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Claude 3 Opus vs Mistral Small 3.1

2 vs 0 benchmarks won

Anthropic
Claude 3 Opus
Mistral
Mistral Small 3.1
Overview
CompanyAnthropicMistral
Release dateMar 4 2024Mar 17 2025
Model type
Open sourceNoYes
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
50.4%
Software engineering
SWE-Bench Verified
33%
Multimodal understanding
MMMU
Timeline
Release gapClaude 3 Opus shipped 378 days before Mistral Small 3.1

Which is better: Claude 3 Opus or Mistral Small 3.1?

Claude 3 Opus leads Mistral Small 3.1 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude 3 Opus shipped 378 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 Opus 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 Opus released?
Claude 3 Opus was released by Anthropic on Mar 4 2024.
When was Mistral Small 3.1 released?
Mistral Small 3.1 was released by Mistral on Mar 17 2025.
Is Claude 3 Opus or Mistral Small 3.1 open source?
Mistral Small 3.1 is an open-source / open-weight model released by Mistral. Claude 3 Opus is a proprietary model released by Anthropic.

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