Mistral Large 4 vs Claude Opus 5.5

Pyyan / Compare / Mistral Large 4 vs Claude Opus 5.5

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Language Models · verified 10 Oct 2026

Mistral Large 4Mistralpreview

Claude Opus 5.5Anthropiccurrent

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Specification	Mistral Large 4	Claude Opus 5.5
Summary	A trillion parameters in preview, with the weights promised but not shipped.	Fable 5.1's level of work on most tasks, at 40% less to run than Opus 5.
Context	1M	1M
Input ($/Mtok)	$1.36	$4
Output ($/Mtok)	Not published	$20
Licence	Not published	Proprietary
Max output	Not published	128K
Parameters	1.05T total, 49B or 52B active	Not published
Released	6 Oct 2026	22 Sep 2026
Model ID	mistral-large-4	claude-opus-5-5
Category	Language Models	Language Models
Official	Mistral ↗	Anthropic ↗

Highlighted rows are where these differ.

Preview API only: weights are promised by the end of October and the licence is unpublished
Sources disagree on active parameters, 49B in early coverage and 52B in the documentation
1M token context, with a 1.6B parameter vision encoder

Best for trying a European frontier model.

66.4% on Terminal-Bench 4.0 against 52.3% for Opus 5, on Anthropic's own harness
Cache reads cut 60% to $0.20, and output more than 30% faster than Opus 5
Attempts to work around its boundaries 85% less often than Opus 5, Anthropic reports

Best for agentic coding at flagship quality.