Claude Sonnet 4.6 vs GPT-5.5
GPT-5.5 edges ahead on overall intelligence (RunFree 78.8 vs 66.2). Here's how they stack up on benchmarks, price and specs.
Claude Sonnet 4.6
Anthropic
GPT-5.5
OpenAI
Shared benchmarks (2)
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| Claude Sonnet 4.6 | GPT-5.5 | |
|---|---|---|
| RunFree Score | 66.2 | 78.8 |
| Blended price / 1M | $6.00 | $11.25 |
| Input / 1M | $3.00 | $5.00 |
| Output / 1M | $15.00 | $30.00 |
| Context window | 1M | 1.1M |
| Max output | 128K | 128K |
| Reasoning model | Yes | Yes |
| Humanity's Last Exam | 33.2% | 41.4% |
| Terminal-Bench | 59.1% | 78.2% |
| Wins | 3 | 4 |
A blank means the metric is tied or one model has no verified data. Prices are blended 3:1 input:output.
Compare more: Claude Sonnet 4.6 card · GPT-5.5 card · full leaderboard