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Claude Opus 4.5 vs Mistral Medium 3.5

2 vs 0 benchmarks won

Anthropic
Claude Opus 4.5
Mistral
Mistral Medium 3.5
Overview
CompanyAnthropicMistral
Release dateNov 24 2025Apr 30 2026
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 gapClaude Opus 4.5 shipped 157 days before Mistral Medium 3.5

Which is better: Claude Opus 4.5 or Mistral Medium 3.5?

Claude Opus 4.5 leads Mistral Medium 3.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Opus 4.5 shipped 157 days before Mistral Medium 3.5, 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 Medium 3.5 released?
Mistral Medium 3.5 was released by Mistral on Apr 30 2026.

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