Noometry

Model comparison

Claude Sonnet 5.5 vs GPT-6 Sol

Claude Sonnet 5.5 and GPT-6 Sol score almost the same on the Noometry Index (61.9 vs 61.8), so choose on price, context window or the category you care about most.

Last verified . 29 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

GPT-6 Sol OpenAI

61.8

Rank #12 Confirmed

Summary

  • They share 29 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and GPT-6 Sol in 2 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where GPT-6 Sol leads 74.0 to 54.0.
  • The biggest single-benchmark swing is APEX-Agents: 75.5% for Claude Sonnet 5.5 and 54.3% for GPT-6 Sol.
  • Both cost about the same: $2 input and $10 output per million tokens.
  • GPT-6 Sol accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Sonnet 5.5GPT-6 Sol
ProviderAnthropicOpenAI
Noometry Index61.961.8
Released2026-09-282026-09-22
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K128K
Input $ / M tokens$2$2
Output $ / M tokens$10$10
Results tracked3245

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), GPT-6 Sol: 60.1 (#11)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
FrontierCode52.1%49.3%
LMArena WebDev17741688
SciCode61%57.6%
LMArena Coding15131447
ALE-Bench1,8192,462
DeepSWE—68.8%
CursorBench55.5%—
FrontierSWE61.9%—

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), GPT-6 Sol: 37.2 (#36)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
APEX-Agents75.5%54.3%
GDP.pdf—26.4%
Vending-Bench 2—14,428

Reasoning GPT-6 Sol leads

Claude Sonnet 5.5: 54.0 (#28), GPT-6 Sol: 74.0 (#9)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
NYT Connections (extended)80.5%90.1%
CritPt31.4%30.9%
LMArena Hard Prompts14951418
Mystery Game Puzzles65%56%
Epoch Capabilities Index165.03162.72
ARC-AGI-2—89.6%
ARC-AGI-1—95.5%
EBR-Bench—53.3%
DTBench—97.3%
LMCA—59.1%

Math Too close to call

Claude Sonnet 5.5: 87.9 (#6), GPT-6 Sol: 87.2 (#7)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
FrontierMath (Tiers 1-3)88.8%89.8%
FrontierMath Tier 480.5%90%
OTIS Mock AIME 2024-2025100%100%
ProofBench100%83%
LMArena Math15101402
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), GPT-6 Sol: 64.8 (#15)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
GPQA Diamond95.6%94.3%
SimpleQA Verified46.5%60.7%
LMArena Expert15401439
Vectara Hallucination Rate—6.5%

Multimodal Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 51.5 (#6), GPT-6 Sol: 47.6 (#10)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
LMArena Vision12891245
Furniture Assembly75%58.3%
Blueprint-Bench 2—36.9%

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), GPT-6 Sol: 50.5 (#118)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
LMArena Non-English14521385
LMArena Chinese15221405
LMArena Russian14511401
LMArena French—1410
LMArena German—1390
LMArena Japanese—1385
LMArena Korean—1341
LMArena Spanish—1384

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), GPT-6 Sol: 74.5 (#94)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
LMArena Instruction Following14951412

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), GPT-6 Sol: 43.1 (#108)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
LMArena Longer Query14981411

Writing & Preference GPT-6 Sol leads

Claude Sonnet 5.5: 66.0 (#40), GPT-6 Sol: 71.9 (#18)

BenchmarkClaude Sonnet 5.5GPT-6 Sol
LMArena Text14711395
LMArena Creative Writing14651378
LMArena Multi-Turn14741412
EQ-Bench Creative Writing—2125

Frequently asked questions

Is Claude Sonnet 5.5 better than GPT-6 Sol?

Claude Sonnet 5.5 and GPT-6 Sol score almost the same on the Noometry Index (61.9 vs 61.8), so choose on price, context window or the category you care about most.

Which is cheaper, Claude Sonnet 5.5 or GPT-6 Sol?

GPT-6 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or GPT-6 Sol better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 60.1 in the Noometry coding category.

Which has the bigger context window?

GPT-6 Sol does, with 1.05M tokens against 1M.

How many benchmarks do Claude Sonnet 5.5 and GPT-6 Sol share?

29 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GPT-6 Sol has 45.

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