Compare · ModelsLive · 2 picked · head to head
Claude Sonnet 5.5 vs GPT-5.5
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Sonnet 5.5 wins on 1/1 benchmarks
Claude Sonnet 5.5 wins 1 of 1 shared benchmarks. Leads in knowledge.
Category leads
knowledge·Claude Sonnet 5.5
Hype vs Reality
Attention vs performance
Claude Sonnet 5.5
#11 by perf·#10 by attention
GPT-5.5
#2 by perf·#4 by attention
Best value
Claude Sonnet 5.5
2.6x better value than GPT-5.5
Claude Sonnet 5.5
12.5 pts/$
$6.00/M
GPT-5.5
4.9 pts/$
$17.50/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
1 benchmark · 2 models
Claude Sonnet 5.5GPT-5.5
GPQA diamond
Claude Sonnet 5.5 leads by +0.5
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Sonnet 5.5
94.1
GPT-5.5
93.6
Full benchmark table
| Benchmark | Claude Sonnet 5.5 | GPT-5.5 |
|---|---|---|
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 94.1 | 93.6 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $2.00 | $10.00 | 1.0M tokens (~500 books) | $40.00 | |
| $5.00 | $30.00 | 400K tokens (~200 books) | $112.50 |