Noometry

Model comparison

Claude Opus 5.5 vs o1-pro

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 31.5 on the Noometry Index.

Last verified . 1 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

o1-pro OpenAI

31.5

Rank #271 Reported

Summary

  • They share 1 benchmark with published results for both. Claude Opus 5.5 scores higher in 2 categories and o1-pro in 0 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 20.4.
  • The biggest single-benchmark swing is ARC-AGI-1: 98.5% for Claude Opus 5.5 and 23.3% for o1-pro.
  • Claude Opus 5.5 is cheaper at $4 / $20 per million input/output tokens, against $150 / $600 for o1-pro.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 200K.

Side by side

Claude Opus 5.5o1-pro
ProviderAnthropicOpenAI
Noometry Index68.631.5
Released2026-09-222025-03-19
WeightsProprietaryProprietary
Context window1M200K
Max output128K100K
Input $ / M tokens$4$150
Output $ / M tokens$20$600
Results tracked443

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Category by category

Coding Not comparable

Claude Opus 5.5: 71.9 (#3), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
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), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), o1-pro: 20.4 (#239)

BenchmarkClaude Opus 5.5o1-pro
ARC-AGI-198.5%23.3%
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
CritPt31.7%—
EnigmaEval—6.1%
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), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1506—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), o1-pro: 29.7 (#234)

BenchmarkClaude Opus 5.5o1-pro
GPQA Diamond90.6%—
Humanity's Last Exam—8.1%
SimpleQA Verified72.2%—
LMArena Expert1547—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
LMArena Longer Query1532—

Writing & Preference Not comparable

Claude Opus 5.5: 78.2 (#3), o1-pro: —

BenchmarkClaude Opus 5.5o1-pro
LMArena Text1515—
LMArena Creative Writing1533—
EQ-Bench Creative Writing2050—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than o1-pro?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 31.5 on the Noometry Index.

Which is cheaper, Claude Opus 5.5 or o1-pro?

Claude Opus 5.5 is cheaper. It lists at $4 per million input tokens and $20 per million output tokens; o1-pro lists at $150 and $600.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 200K.

How many benchmarks do Claude Opus 5.5 and o1-pro share?

1 benchmark has published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and o1-pro has 3.

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