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Claude Sonnet 4.5 vs Mistral Small

3 vs 0 benchmarks won

Anthropic
Claude Sonnet 4.5
Mistral
Mistral Small
Overview
CompanyAnthropicMistral
Release dateSep 29 2025Feb 26 2024
Model type
Open sourceNoNo
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
83.4%
Software engineering
SWE-Bench Verified
77.2%
Multimodal understanding
MMMU
68%
Timeline
Release gapMistral Small shipped 581 days before Claude Sonnet 4.5

Which is better: Claude Sonnet 4.5 or Mistral Small?

Claude Sonnet 4.5 leads Mistral Small on 3 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Mistral Small shipped 581 days before Claude Sonnet 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 Sonnet 4.5 released?
Claude Sonnet 4.5 was released by Anthropic on Sep 29 2025.
When was Mistral Small released?
Mistral Small was released by Mistral on Feb 26 2024.

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