Noometry

Model comparison

Claude Opus 5.5 vs Mistral Large 4

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.1 on the Noometry Index. Mistral Large 4 costs 7.7× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 15 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Mistral Large 4 Mistral AI

43.1

Rank #99 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and Mistral Large 4 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 22.5.
  • The biggest single-benchmark swing is NYT Connections (extended): 88.5% for Claude Opus 5.5 and 27.4% for Mistral Large 4.
  • Mistral Large 4 is cheaper at $0.68 / $2.09 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Mistral Large 4 accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Opus 5.5Mistral Large 4
ProviderAnthropicMistral AI
Noometry Index68.643.1
Released2026-09-222026-10-06
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K262K
Input $ / M tokens$4$0.68
Output $ / M tokens$20$2.09
Results tracked4415

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Mistral Large 4: 48.6 (#57)

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena WebDev18131541
LMArena Coding15471475
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Mistral Large 4: —

BenchmarkClaude Opus 5.5Mistral Large 4
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Mistral Large 4: 22.5 (#192)

BenchmarkClaude Opus 5.5Mistral Large 4
NYT Connections (extended)88.5%27.4%
LMArena Hard Prompts15351444
ARC-AGI-293.3%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Mistral Large 4: 40.4 (#91)

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena Math15061488
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Mistral Large 4: 36.6 (#166)

BenchmarkClaude Opus 5.5Mistral Large 4
SimpleQA Verified72.2%20%
LMArena Expert15471447
GPQA Diamond90.6%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Mistral Large 4: —

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Mistral Large 4: 52.6 (#82)

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena Non-English15071415
LMArena Chinese15881491
LMArena Russian15201414
LMArena French1514—
LMArena Spanish1507—

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Mistral Large 4: 75.0 (#76)

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena Instruction Following15371424

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Mistral Large 4: 43.6 (#89)

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena Longer Query15321429

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Mistral Large 4: 60.4 (#97)

BenchmarkClaude Opus 5.5Mistral Large 4
LMArena Text15151427
LMArena Creative Writing15331361
LMArena Multi-Turn14991424
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Mistral Large 4?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.1 on the Noometry Index. Mistral Large 4 costs 7.7× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Mistral Large 4?

Mistral Large 4 is cheaper. It lists at $0.68 per million input tokens and $2.09 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Mistral Large 4 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 48.6 in the Noometry coding category.

Which has the bigger context window?

Mistral Large 4 does, with 1.05M tokens against 1M.

How many benchmarks do Claude Opus 5.5 and Mistral Large 4 share?

15 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Mistral Large 4 has 15.

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