Claude Opus 4.5 vs GPT-5.5
Head to head on 25 shared benchmarks, with price, context window, and release dates.
Benchmark scores
68evals · sort by any column, ⤢ to expand fullscreen
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| Claude Opus 4.5 Anthropic | 61.3% | 1683elo | 73.1 | 20.7% | 81.0% | 13.2% | 43.0% | 78.1% | 79.7% | 74.4% | 62.5% | 81.3% | 90.4% | 80.1% | 45.2% | 83.2% | 88.9% | 68.7% | 36.0% | 45.0% | 47.0% | 74.3% | 40.9% | 20.6% | 86.3% | 62.7% | - | - | - | - | 16.7% | - | - | - | 35.6% | 6.1% | - | - | - | - | - | - | - | 84.7% | - | 12.13 | - | 83.8% | 83.5% | - | 73.8% | - | 100.0% | 37.4 | - | - | - | 77.5% | 45.3 | - | 70.7% | 79.2% | - | - | 61.8 | - | - | - | 62.2% |
| GPT-5.5 OpenAI | 68.4% | 1844elo | 78.2 | 51.7% | 76.8% | 13.7% | 46.1% | 84.7% | 82.5% | 81.1% | 73.0% | 87.7% | 96.3% | 87.7% | 49.1% | 86.9% | 88.6% | 68.8% | 50.0% | 51.5% | 47.3% | 75.0% | 49.2% | 69.8% | 69.3% | - | 86.2% | 54.2% | 12.9% | 36.2% | - | 86.0% | 90.0% | 100.0% | - | - | 1315elo | 34.0% | 51.8% | 5.7% | 44.8% | 24.9% | 1769elo | - | 15.1% | - | 51.8% | - | - | 2.1% | - | 92.8% | - | - | 78.7% | 45.3% | 100.0% | - | - | 4.2 | - | - | 58.6% | 75.7% | - | 83.4% | 57.4% | 68.1% | 61.9% |
2 / 2 models
| Attribute | Claude Opus 4.5 Anthropic | GPT-5.5 OpenAI |
|---|---|---|
| Description | Claude Opus 4.5 is an AI model from Anthropic. | GPT-5.5 is an AI model from OpenAI. |
| Family | Claude | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 24 Nov 2025 | 23 Apr 2026 |
| Context | 200,000 | 1,050,000 |
| Input $/1M | $5.00 | $5.00 |
| Output $/1M | $25.00 | $30.00 |
| Cache read $/1M | $0.500 | $0.500 |
| Cache write $/1M | $6.250 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | file, image, text | file, image, text |
| Providers | - | - |
| Publisher | Anthropic | OpenAI |
| Reported scores | GPQA Diamond76.8% (AA) Humanity's Last Exam (HLE)13.7% (AA) IFBench46.1% (AA) SciCode47.3% (AA) τ²-bench (Tau²-bench)69.3% (AA) |
FAQ
- Is Claude Opus 4.5 or GPT-5.5 better?
- Across the 25 benchmarks both models report on Sophon, GPT-5.5 leads on 22 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.5 and GPT-5.5 compare on GPQA Diamond?
- Claude Opus 4.5 scores 81.0% and GPT-5.5 scores 76.8% on GPQA Diamond.
- Which is cheaper, Claude Opus 4.5 or GPT-5.5?
- Claude Opus 4.5 is cheaper at $25.00 per million output tokens against $30.00 for GPT-5.5 - about 1.2x.
- When were Claude Opus 4.5 and GPT-5.5 released?
- Claude Opus 4.5 was released 24 Nov 2025 by Anthropic. GPT-5.5 was released 23 Apr 2026 by OpenAI.
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