▸ compare
Anthropic: Claude Sonnet 4.5 vs OpenAI: GPT-5.1
Side-by-side benchmark comparison based on independent public data. Scores, pricing, context, and task breakdown.
▸ verdict
Anthropic: Claude Sonnet 4.5
85.7
higher score
vs
OpenAI: GPT-5.1
81.1
Anthropic: Claude Sonnet 4.5 leads with a higher composite benchmark score. It's the stronger choice for general-purpose tasks based on public benchmark data.
▸ score breakdown
| Task | Anthropic: Claude Sonnet 4.5 | OpenAI: GPT-5.1 | Δ |
|---|---|---|---|
| Overall | 85.7 | 81.1 | +4.6 |
| Coding | 59.8 | 61.1 | -1.3 |
| Reasoning | 45.0 | 68.4 | -23.4 |
| Math | — | 84.0 | — |
| Writing | 84.3 | 80.0 | +4.3 |
| JSON | 28.6 | — | — |
▸ specs & pricing
| Attribute | Anthropic: Claude Sonnet 4.5 | OpenAI: GPT-5.1 |
|---|---|---|
| Provider | Anthropic | Openai |
| Context window | 1M | 400K |
| Input $/M tokens | $3.00/M | $1.25/M |
| Output $/M tokens | $15.00/M | $10.00/M |
| Weights | proprietary | proprietary |
▸ frequently asked
Is Anthropic: Claude Sonnet 4.5 better than OpenAI: GPT-5.1?
Anthropic: Claude Sonnet 4.5 scores higher overall (85.7 vs 81.1) in the benchmark composite. The best choice depends on the specific use case and budget.
Which is cheaper: Anthropic: Claude Sonnet 4.5 or OpenAI: GPT-5.1?
OpenAI: GPT-5.1 is cheaper at $1.25/M input tokens vs $3/M for Anthropic: Claude Sonnet 4.5.
Which model is better for coding?
Both models perform similarly on coding benchmarks (SWE-Bench, Aider Polyglot, LiveCodeBench).