Noometry

Model comparison

Claude Sonnet 5.5 vs GPT-5.2 Pro

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 52.3 on the Noometry Index.

Last verified . 4 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

GPT-5.2 Pro OpenAI

52.3

Rank #39 Reported

Summary

  • They share 4 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 2 categories and GPT-5.2 Pro in 0 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 65.3.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 80.5% for Claude Sonnet 5.5 and 46% for GPT-5.2 Pro.
  • Claude Sonnet 5.5 is cheaper at $2 / $10 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
  • Claude Sonnet 5.5 accepts more context: 1M tokens versus 400K.

Side by side

Claude Sonnet 5.5GPT-5.2 Pro
ProviderAnthropicOpenAI
Noometry Index61.952.3
Released2026-09-282025-12-11
WeightsProprietaryProprietary
Context window1M400K
Max output128K128K
Input $ / M tokens$2$21
Output $ / M tokens$10$168
Results tracked328

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Category by category

Coding Not comparable

Claude Sonnet 5.5: 67.3 (#6), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
FrontierCode52.1%—
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
LMArena Coding1513—
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
APEX-Agents75.5%—

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), GPT-5.2 Pro: 51.5 (#33)

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
NYT Connections (extended)80.5%79.3%
Epoch Capabilities Index165.03155.4
ARC-AGI-2—54.2%
SimpleBench—57.4%
ARC-AGI-1—90.5%
CritPt31.4%—
LMArena Hard Prompts1495—
Mystery Game Puzzles65%—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), GPT-5.2 Pro: 65.3 (#29)

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
FrontierMath (Tiers 1-3)88.8%74%
FrontierMath Tier 480.5%46%
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math1510—
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—31.3%

Knowledge Not comparable

Claude Sonnet 5.5: 66.0 (#12), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
GPQA Diamond95.6%—
SimpleQA Verified46.5%—
LMArena Expert1540—

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Not comparable

Claude Sonnet 5.5: 55.3 (#30), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
LMArena Non-English1452—
LMArena Chinese1522—
LMArena Russian1451—

Instruction Following Not comparable

Claude Sonnet 5.5: 78.3 (#11), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
LMArena Instruction Following1495—

Long Context Not comparable

Claude Sonnet 5.5: 45.9 (#28), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
LMArena Longer Query1498—

Writing & Preference Not comparable

Claude Sonnet 5.5: 66.0 (#40), GPT-5.2 Pro: —

BenchmarkClaude Sonnet 5.5GPT-5.2 Pro
LMArena Text1471—
LMArena Creative Writing1465—
LMArena Multi-Turn1474—

Frequently asked questions

Is Claude Sonnet 5.5 better than GPT-5.2 Pro?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 52.3 on the Noometry Index.

Which is cheaper, Claude Sonnet 5.5 or GPT-5.2 Pro?

Claude Sonnet 5.5 is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 400K.

How many benchmarks do Claude Sonnet 5.5 and GPT-5.2 Pro share?

4 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GPT-5.2 Pro has 8.

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