Noometry

Model comparison

Claude Opus 5.5 vs Pixtral Large

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 32.2 on the Noometry Index. Pixtral Large costs 2.7× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 2 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Pixtral Large Mistral AI

32.2

Rank #259 Reported

Summary

  • They share 2 benchmarks with published results for both. Claude Opus 5.5 scores higher in 3 categories and Pixtral Large in 0 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 21.7.
  • Pixtral Large is cheaper at $2 / $6 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 128K.
  • Pixtral Large has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Pixtral Large
ProviderAnthropicMistral AI
Noometry Index68.632.2
Released2026-09-222024-11-01
WeightsProprietaryOpen
Context window1M128K
Max output128K128K
Input $ / M tokens$4$2
Output $ / M tokens$20$6
Results tracked443

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Category by category

Coding Not comparable

Claude Opus 5.5: 71.9 (#3), Pixtral Large: —

BenchmarkClaude Opus 5.5Pixtral Large
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
LMArena Coding1547—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

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

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

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Pixtral Large: 21.7 (#218)

BenchmarkClaude Opus 5.5Pixtral Large
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
EnigmaEval—0.8%
EBR-Bench71.4%—
LMArena Hard Prompts1535—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Not comparable

Claude Opus 5.5: 91.8 (#3), Pixtral Large: —

BenchmarkClaude Opus 5.5Pixtral Large
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1506—
FrontierMath Erdős2.9%—

Knowledge Not comparable

Claude Opus 5.5: 66.4 (#10), Pixtral Large: —

BenchmarkClaude Opus 5.5Pixtral Large
GPQA Diamond90.6%—
SimpleQA Verified72.2%—
LMArena Expert1547—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 57.8 (#1), Pixtral Large: 30.6 (#111)

BenchmarkClaude Opus 5.5Pixtral Large
LMArena Vision13211089
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), Pixtral Large: —

BenchmarkClaude Opus 5.5Pixtral Large
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), Pixtral Large: —

BenchmarkClaude Opus 5.5Pixtral Large
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), Pixtral Large: —

BenchmarkClaude Opus 5.5Pixtral Large
LMArena Longer Query1532—

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Pixtral Large: 32.9 (#278)

BenchmarkClaude Opus 5.5Pixtral Large
EQ-Bench Creative Writing2050988
LMArena Text1515—
LMArena Creative Writing1533—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than Pixtral Large?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 32.2 on the Noometry Index. Pixtral Large costs 2.7× 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 Pixtral Large?

Pixtral Large is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 128K.

How many benchmarks do Claude Opus 5.5 and Pixtral Large share?

2 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Pixtral Large has 3.

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