Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs GPT-6.1 Sol
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 14/20 benchmarks
Claude Opus 5.5 wins 14 of 20 shared benchmarks. Leads in speed · agentic · reasoning.
Category leads
speed·Claude Opus 5.5agentic·Claude Opus 5.5reasoning·Claude Opus 5.5general·Claude Opus 5.5coding·Claude Opus 5.5math·GPT-6.1 Solknowledge·GPT-6.1 Sol
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#3 by perf·#7 by attention
GPT-6.1 Sol
#6 by perf·#2 by attention
Best value
GPT-6.1 Sol
2.0x better value than Claude Opus 5.5
Claude Opus 5.5
6.9 pts/$
$12.00/M
GPT-6.1 Sol
13.4 pts/$
$6.00/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
20 benchmarks · 2 models
Claude Opus 5.5GPT-6.1 Sol
Artificial Analysis · CritPt
Claude Opus 5.5
31.7
GPT-6.1 Sol
31.7
Artificial Analysis · GDPval
Claude Opus 5.5 leads by +14.5
Claude Opus 5.5
68.3
GPT-6.1 Sol
53.8
Artificial Analysis · Humanity's Last Exam
Claude Opus 5.5 leads by +8.5
Claude Opus 5.5
61.4
GPT-6.1 Sol
52.9
Artificial Analysis · Long Context Reasoning
Claude Opus 5.5 leads by +1.7
Claude Opus 5.5
84.7
GPT-6.1 Sol
83.0
Artificial Analysis · MMMU Pro
Claude Opus 5.5 leads by +1.7
Claude Opus 5.5
87.7
GPT-6.1 Sol
86.0
Artificial Analysis · Quality Index
Claude Opus 5.5 leads by +5.8
Claude Opus 5.5
57.6
GPT-6.1 Sol
51.8
Artificial Analysis · SciCode
Claude Opus 5.5 leads by +12.7
Claude Opus 5.5
66.9
GPT-6.1 Sol
54.2
APEX-Agents
Claude Opus 5.5 leads by +13.5
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Opus 5.5
73.5
GPT-6.1 Sol
60.0
ARC-AGI
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Opus 5.5
98.5
GPT-6.1 Sol
98.5
ARC-AGI-2
GPT-6.1 Sol leads by +0.8
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
Claude Opus 5.5
93.3
GPT-6.1 Sol
94.2
Ebr Bench
Claude Opus 5.5 leads by +17.1
Claude Opus 5.5
71.4
GPT-6.1 Sol
54.3
Frontiercode
Claude Opus 5.5 leads by +4.4
Claude Opus 5.5
54.6
GPT-6.1 Sol
50.2
FrontierMath-Tier-4-v2-Private
GPT-6.1 Sol leads by +5.0
Claude Opus 5.5
95.0
GPT-6.1 Sol
100.0
FrontierMath-Tiers-1-3-v2-Private
GPT-6.1 Sol leads by +2.5
Claude Opus 5.5
91.2
GPT-6.1 Sol
93.7
Furniture Assembly
Claude Opus 5.5 leads by +4.8
Claude Opus 5.5
76.2
GPT-6.1 Sol
71.4
GPQA diamond
GPT-6.1 Sol leads by +6.4
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Opus 5.5
87.5
GPT-6.1 Sol
93.9
Mystery Game Puzzles
GPT-6.1 Sol leads by +9.9
Claude Opus 5.5
68.0
GPT-6.1 Sol
78.0
OTIS Mock AIME 2024-2025
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Opus 5.5
100.0
GPT-6.1 Sol
100.0
Proofbench
Claude Opus 5.5 leads by +1.0
Claude Opus 5.5
100.0
GPT-6.1 Sol
99.0
SimpleQA Verified
GPT-6.1 Sol leads by +1.7
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Opus 5.5
72.2
GPT-6.1 Sol
73.9
Full benchmark table
| Benchmark | Claude Opus 5.5 | GPT-6.1 Sol |
|---|---|---|
Artificial Analysis · CritPt | 31.7 | 31.7 |
Artificial Analysis · GDPval | 68.3 | 53.8 |
Artificial Analysis · Humanity's Last Exam | 61.4 | 52.9 |
Artificial Analysis · Long Context Reasoning | 84.7 | 83.0 |
Artificial Analysis · MMMU Pro | 87.7 | 86.0 |
Artificial Analysis · Quality Index | 57.6 | 51.8 |
Artificial Analysis · SciCode | 66.9 | 54.2 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 73.5 | 60.0 |
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 98.5 | 98.5 |
ARC-AGI-2 ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data. | 93.3 | 94.2 |
Ebr Bench | 71.4 | 54.3 |
Frontiercode | 54.6 | 50.2 |
FrontierMath-Tier-4-v2-Private | 95.0 | 100.0 |
FrontierMath-Tiers-1-3-v2-Private | 91.2 | 93.7 |
Furniture Assembly | 76.2 | 71.4 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 87.5 | 93.9 |
Mystery Game Puzzles | 68.0 | 78.0 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 100.0 | 100.0 |
Proofbench | 100.0 | 99.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 72.2 | 73.9 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 | |
| $2.00 | $10.00 | 1.1M tokens (~525 books) | $40.00 |