Noometry

Model comparison

Claude Opus 5.5 vs Pixtral 12B

Claude Opus 5.5 has enough public results to be ranked (#3); Pixtral 12B does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Pixtral 12B Mistral AI

31.3

Unranked Sparse

Summary

  • They share 1 benchmark with published results for both. Claude Opus 5.5 scores higher in 1 category and Pixtral 12B in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in multimodal, where Claude Opus 5.5 leads 57.8 to 23.9.
  • Pixtral 12B is cheaper at $0.15 / $0.15 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 12B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Pixtral 12B
ProviderAnthropicMistral AI
Noometry Index68.631.3
Released2026-09-222024-09-01
WeightsProprietaryOpen
Context window1M128K
Max output128K128K
Input $ / M tokens$4$0.15
Output $ / M tokens$20$0.15
Results tracked442

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Category by category

Coding Not comparable

Claude Opus 5.5: 71.9 (#3), Pixtral 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
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 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Not comparable

Claude Opus 5.5: 80.2 (#3), Pixtral 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
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 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
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 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
GPQA Diamond90.6%—
SimpleQA Verified72.2%—
LMArena Expert1547—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 57.8 (#1), Pixtral 12B: 23.9 (#127)

BenchmarkClaude Opus 5.5Pixtral 12B
LMArena Vision13211009
GeoBench—37%
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), Pixtral 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), Pixtral 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), Pixtral 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
LMArena Longer Query1532—

Writing & Preference Not comparable

Claude Opus 5.5: 78.2 (#3), Pixtral 12B: —

BenchmarkClaude Opus 5.5Pixtral 12B
LMArena Text1515—
LMArena Creative Writing1533—
EQ-Bench Creative Writing2050—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than Pixtral 12B?

Claude Opus 5.5 has enough public results to be ranked (#3); Pixtral 12B does not yet, so treat this comparison as directional.

Which is cheaper, Claude Opus 5.5 or Pixtral 12B?

Pixtral 12B is cheaper. It lists at $0.15 per million input tokens and $0.15 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 12B share?

1 benchmark has published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Pixtral 12B has 2.

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