Compare · ModelsLive · 2 picked · head to head
Claude Opus 5 vs GPT-5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.5 wins on 1/2 benchmarks
GPT-5.5 wins 1 of 2 shared benchmarks. Leads in knowledge.
Category leads
reasoning·Claude Opus 5knowledge·GPT-5.5
Hype vs Reality
Attention vs performance
Claude Opus 5
#21 by perf·#6 by attention
GPT-5.5
#2 by perf·#4 by attention
Best value
GPT-5.5
1.0x better value than Claude Opus 5
Claude Opus 5
4.6 pts/$
$15.00/M
GPT-5.5
4.9 pts/$
$17.50/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
2 benchmarks · 2 models
Claude Opus 5GPT-5.5
ARC-AGI
Claude Opus 5 leads by +2.5
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Opus 5
97.5
GPT-5.5
95.0
GPQA diamond
GPT-5.5 leads by +1.8
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
91.8
GPT-5.5
93.6
Full benchmark table
| Benchmark | Claude Opus 5 | GPT-5.5 |
|---|---|---|
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 97.5 | 95.0 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 91.8 | 93.6 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $5.00 | $25.00 | 1.0M tokens (~500 books) | $100.00 | |
| $5.00 | $30.00 | 400K tokens (~200 books) | $112.50 |