Noometry

Model comparison

Claude Opus 5.5 vs GPT-6 Sol

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 61.8 on the Noometry Index. GPT-6 Sol costs 2.0× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 40 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

GPT-6 Sol OpenAI

61.8

Rank #12 Confirmed

Summary

  • They share 40 benchmarks with published results for both. Claude Opus 5.5 scores higher in 10 categories and GPT-6 Sol in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in coding, where Claude Opus 5.5 leads 71.9 to 60.1.
  • The biggest single-benchmark swing is Furniture Assembly: 83.3% for Claude Opus 5.5 and 58.3% for GPT-6 Sol.
  • GPT-6 Sol is cheaper at $2 / $10 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • GPT-6 Sol accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Opus 5.5GPT-6 Sol
ProviderAnthropicOpenAI
Noometry Index68.661.8
Released2026-09-222026-09-22
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K128K
Input $ / M tokens$4$2
Output $ / M tokens$20$10
Results tracked4445

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), GPT-6 Sol: 60.1 (#11)

BenchmarkClaude Opus 5.5GPT-6 Sol
FrontierCode54.6%49.3%
LMArena WebDev18131688
SciCode66.9%57.6%
LMArena Coding15471447
ALE-Bench2,1472,462
DeepSWE—68.8%
CursorBench57.8%—
FrontierSWE62.3%—
MirrorCode77.4%—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), GPT-6 Sol: 37.2 (#36)

BenchmarkClaude Opus 5.5GPT-6 Sol
APEX-Agents73.5%54.3%
GDP.pdf30.6%26.4%
Vending-Bench 29,23514,428

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), GPT-6 Sol: 74.0 (#9)

BenchmarkClaude Opus 5.5GPT-6 Sol
ARC-AGI-293.3%89.6%
NYT Connections (extended)88.5%90.1%
ARC-AGI-198.5%95.5%
CritPt31.7%30.9%
EBR-Bench71.4%53.3%
LMArena Hard Prompts15351418
Mystery Game Puzzles71%56%
DTBench98.9%97.3%
LMCA68.2%59.1%
Epoch Capabilities Index167.33162.72

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), GPT-6 Sol: 87.2 (#7)

BenchmarkClaude Opus 5.5GPT-6 Sol
FrontierMath (Tiers 1-3)91.2%89.8%
FrontierMath Tier 495%90%
OTIS Mock AIME 2024-2025100%100%
ProofBench100%83%
LMArena Math15061402
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), GPT-6 Sol: 64.8 (#15)

BenchmarkClaude Opus 5.5GPT-6 Sol
GPQA Diamond90.6%94.3%
SimpleQA Verified72.2%60.7%
LMArena Expert15471439
Vectara Hallucination Rate—6.5%

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 57.8 (#1), GPT-6 Sol: 47.6 (#10)

BenchmarkClaude Opus 5.5GPT-6 Sol
LMArena Vision13211245
Blueprint-Bench 251.2%36.9%
Furniture Assembly83.3%58.3%

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), GPT-6 Sol: 50.5 (#118)

BenchmarkClaude Opus 5.5GPT-6 Sol
LMArena Non-English15071385
LMArena Chinese15881405
LMArena French15141410
LMArena Russian15201401
LMArena Spanish15071384
LMArena German—1390
LMArena Japanese—1385
LMArena Korean—1341

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), GPT-6 Sol: 74.5 (#94)

BenchmarkClaude Opus 5.5GPT-6 Sol
LMArena Instruction Following15371412

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), GPT-6 Sol: 43.1 (#108)

BenchmarkClaude Opus 5.5GPT-6 Sol
LMArena Longer Query15321411

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), GPT-6 Sol: 71.9 (#18)

BenchmarkClaude Opus 5.5GPT-6 Sol
LMArena Text15151395
LMArena Creative Writing15331378
EQ-Bench Creative Writing20502125
LMArena Multi-Turn14991412

Frequently asked questions

Is Claude Opus 5.5 better than GPT-6 Sol?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 61.8 on the Noometry Index. GPT-6 Sol costs 2.0× 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 GPT-6 Sol?

GPT-6 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

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

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 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 Opus 5.5 and GPT-6 Sol share?

40 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and GPT-6 Sol has 45.

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