Claude Sonnet 4.5 vs GPT-5.1
GPT-5.1 costs 43% less at typical usage ($3.44 vs $6.00 per 1M tokens). They're tied on task-quality scores, 5 tasks each.
| Spec | Claude Sonnet 4.5 | GPT-5.1 |
|---|---|---|
| Input /1M | $3.00 | $1.25 |
| Output /1M | $15.0 | $10.0 |
| Typical /1M | $6.00 | $3.44 |
| Context window | 200k | 400k |
| Speed | Brisk | Brisk |
| Privacy | Strong | Standard |
| Open weights | No | No |
Claude Sonnet 4.5
Steady since we started tracking (Jul 13, 2026)
GPT-5.1
Steady since we started tracking (Jul 13, 2026)
Quality by task
Coding95/94
Agents95/93
Reasoning93/96
Writing93/92
Chat91/93
Classify88/88
Extract90/89
Summarize92/91
Translate88/90
Vision90/94
General93/94
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Prices are list $/1M tokens, hand-maintained from public provider pricing. Task scores are benchmark-informed 0-100 estimates, not gospel — validate on your own evals before moving production traffic. Not affiliated with any model provider.