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GPT-5.1 vs Claude Sonnet 5
Claude Sonnet 5 leads on 2 of 3 shared benchmarks. GPT-5.1 is 1.2× cheaper per token on a blended 3:1 basis. Claude Sonnet 5 accepts the larger context window (1M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5.1 | Claude Sonnet 5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input $/1M | $1.25 | $2.00 |
| Output $/1M | $10.00 | $10.00 |
| Blended $/1M | $3.44 | $4.00 |
| Context window | 400K | 1M |
| Max output | 128K | 128K |
| Released | Nov 2025 | Jun 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 87.6% | 90.5% |
| SimpleQA Verified | 48.9% | 25.0% |
| OTIS Mock AIME | 88.6% | 94.7% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose GPT-5.1 if…
- Costs less per token — $3.44 vs $4.00 blended
- Higher SimpleQA Verified (48.9% vs 25.0%)
Choose Claude Sonnet 5 if…
- Higher GPQA Diamond (90.5% vs 87.6%)
- Higher OTIS Mock AIME (94.7% vs 88.6%)
- Larger context window (1M)
- Newer model (released Jun 2026)
FAQ
Which is better, GPT-5.1 or Claude Sonnet 5?
Across the 3 benchmarks both models have independently-run scores for, GPT-5.1 leads on 1 and Claude Sonnet 5 leads on 2. Benchmarks are one input — price and context window are on this page too.
Is GPT-5.1 cheaper than Claude Sonnet 5?
GPT-5.1 is cheaper: $3.44 versus $4.00 per million tokens blended at 3:1 input:output. Input alone: $1.25 vs $2.00. Output alone: $10.00 vs $10.00.
What context windows do GPT-5.1 and Claude Sonnet 5 have?
GPT-5.1: 400,000 tokens. Claude Sonnet 5: 1,000,000 tokens.
Who makes GPT-5.1 and Claude Sonnet 5?
GPT-5.1 is made by OpenAI. Claude Sonnet 5 is made by Anthropic.