GPT-5.1vsClaude Sonnet 4.5
Across 11 shared benchmarks, Claude Sonnet 4.5 leads overall: GPT-5.1 wins 3, Claude Sonnet 4.5 wins 8, with 0 ties and an average score difference of -6.37.
GPT-5.1
OpenAI · 2025-11-12 · Reasoning model
Claude Sonnet 4.5
Anthropic · 2025-09-30 · Chat model
GPT-5.13 wins(27%)(73%)8 winsClaude Sonnet 4.5
Benchmark scores
Grouped by capability, sorted by largest gap within each. 11 shared benchmarks.
Agent Level Benchmark
Claude Sonnet 4.5 2/2| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| τ²-Bench - Telecom | 46.50178 / 264Normal (With Tools) | 70.50138 / 264Normal (With Tools) | -24 |
| Terminal Bench Hard | 22.70143 / 244Normal (With Tools) | 28.80116 / 244Normal (With Tools) | -6.10 |
General Knowledge
Claude Sonnet 4.5 2/2| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| LiveBench | 42.65108 / 117Normal (No Tools) | 53.6985 / 117Normal (No Tools) | -11.04 |
| HLE | 5.30471 / 563Normal (No Tools) · Text only | 7.20436 / 563Normal (No Tools) · Text only | -1.90 |
Math and Reasoning
GPT-5.1 2/2| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| IMO-ProofBench Advanced | 7.1016 / 24Thinking (No Tools) | 4.8019 / 24Thinking (No Tools) | +2.30 |
| AIME2025 | 38170 / 215Normal (No Tools) | 37173 / 215Normal (No Tools) | +1 |
Coding and Software Engineer
Claude Sonnet 4.5 1/1| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| LiveCodeBench | 49.40167 / 250Normal (No Tools) | 59136 / 250Normal (No Tools) | -9.60 |
General Evaluation
Claude Sonnet 4.5 1/1| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| GPQA Diamond | 64.30361 / 462Normal (No Tools) | 73.70292 / 462Normal (No Tools) | -9.40 |
Instruction Following
GPT-5.1 1/1| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| IF Bench | 43.20192 / 282Normal (No Tools) | 42.70199 / 282Normal (No Tools) | +0.50 |
Long Context
Claude Sonnet 4.5 1/1| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| AA-LCR | 45147 / 170Normal (No Tools) | 54133 / 170Normal (No Tools) | -9 |
Multimodal Understanding
Claude Sonnet 4.5 1/1| Benchmark | GPT-5.1 | Claude Sonnet 4.5 | Diff |
|---|---|---|---|
| MMMU-Pro | 62.40163 / 227Normal (No Tools) | 65.20151 / 227Normal (No Tools) | -2.80 |
Specs
| Field | GPT-5.1 | Claude Sonnet 4.5 |
|---|---|---|
| Publisher | OpenAI | Anthropic |
| Release date | 2025-11-12 | 2025-09-30 |
| Model type | Reasoning model | Chat model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 400K | 1000K |
| Max output | 128K | 64K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | GPT-5.1 | Claude Sonnet 4.5 |
|---|---|---|
| Text input | $1.25 / 1M tokens | $3 / 1M tokens |
| Text output | $10 / 1M tokens | $15 / 1M tokens |
| Cache read | $0.125 / 1M tokens | $0.3 / 1M tokens |
| Cache write | $0 / 1M tokens | $3.75 / 1M tokens |
Summary
- GPT-5.1leads in:Math and Reasoning (2/2), Instruction Following (1/1)
- Claude Sonnet 4.5leads in:Agent Level Benchmark (2/2), General Knowledge (2/2), Coding and Software Engineer (1/1), General Evaluation (1/1), Long Context (1/1), Multimodal Understanding (1/1)
On average across the 11 shared benchmarks, Claude Sonnet 4.5 scores 6.37 higher.
Largest single-benchmark gap: τ²-Bench - Telecom — GPT-5.1 46.50 vs Claude Sonnet 4.5 70.50 (-24).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.