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Claude Opus 4.5 vs Mistral Small

2 vs 0 benchmarks won

Anthropic
Claude Opus 4.5
Mistral
Mistral Small
Overview
CompanyAnthropicMistral
Release dateNov 24 2025Feb 26 2024
Model type
Open sourceNoNo
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
87%
Software engineering
SWE-Bench Verified
80.9%
Multimodal understanding
MMMU
Timeline
Release gapMistral Small shipped 637 days before Claude Opus 4.5

Which is better: Claude Opus 4.5 or Mistral Small?

Claude Opus 4.5 leads Mistral Small on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Mistral Small shipped 637 days before Claude Opus 4.5, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

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 Opus 4.5 released?
Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
When was Mistral Small released?
Mistral Small was released by Mistral on Feb 26 2024.

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