Claude Opus 4.8 vs GPT-5
Head to head on 17 shared benchmarks, with price, context window, and release dates.
Benchmark scores
87evals · sort by any column, ⤢ to expand fullscreen
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| Claude Opus 4.8 Anthropic | 66.7% | 1835elo | 80.8 | 47.2% | 92.0% | 48.7% | 62.2% | 53.2% | 85.8% | 69.9% | 69.0% | 54.8% | 53.5% | 75.6% | 58.3% | 82.7% | 94.4% | - | - | - | - | - | - | 15.5% | - | 80.4% | 14.5% | - | - | - | 67.0% | - | - | - | 1281elo | 40.0% | 53.9% | - | 13.4% | 22.5% | - | 1890elo | - | - | - | 56.9% | - | - | 10.4% | - | 80.1% | 79.3% | 78.3% | 67.4% | 81.4% | 84.3% | 89.7% | - | - | - | - | - | - | 91.8% | - | - | - | - | - | - | - | - | - | 83.4% | - | - | - | 69.2% | - | 82.7% | - | - | 60.9% | 70.9% | - | - | - | 63.4% |
| GPT-5 OpenAI | 61.1% | 1623elo | 72.8 | 32.4% | 68.6% | 6.6% | 45.0% | 49.6% | 83.7% | 65.5% | 18.0% | 43.7% | 37.8% | 73.4% | 12.9% | 20.1% | 0.0% | 46.7% | 91.1% | 88.0% | 94.6% | 48.3% | 0.0% | - | 0.15 | - | - | 0.0% | 68.1% | 4.58 | - | 57.7% | 80.0% | 80.0% | - | - | - | 91.7% | - | - | 0.0% | - | 88.9% | 83.3% | 100.0% | - | 48.9% | 83.4% | - | 58.2% | - | - | - | - | - | - | - | 54.3% | 37.5% | 0.52 | 1.62 | 100.0% | 86.1% | - | 0.0% | 92.7% | 92.7% | 93.3% | 10.0% | 82.0% | 0.0% | 60.0% | 0.26 | - | 0.0% | 74.9% | 74.4% | - | 2.34 | - | 87.5% | 0.86 | - | - | 54.8% | 90.0% | 90.0% | 56.7% |
2 / 2 models
| Attribute | Claude Opus 4.8 Anthropic | GPT-5 OpenAI |
|---|---|---|
| Description | Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic. | OpenAI's August 2025 unified frontier model that auto-routes between a fast model and a deeper "thinking" variant. |
| Family | Claude | GPT 5 |
| Params | - | Undisclosed (closed) |
| Open weights | - | closed |
| License | - | Proprietary |
| Released | 28 May 2026 | 7 Aug 2025 |
| Context | 1,000,000 | 400,000 |
| Input $/1M | $5.00 | - |
| Output $/1M | $25.00 | - |
| Cache read $/1M | $0.500 | $0.125 |
| Cache write $/1M | $6.250 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image, file |
| Providers | - | openai |
| Publisher | Anthropic | OpenAI |
| Reported scores |
FAQ
- Is Claude Opus 4.8 or GPT-5 better?
- Across the 17 benchmarks both models report on Sophon, Claude Opus 4.8 leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.8 and GPT-5 compare on GPQA Diamond?
- Claude Opus 4.8 scores 92.0% and GPT-5 scores 68.6% on GPQA Diamond.
- When were Claude Opus 4.8 and GPT-5 released?
- Claude Opus 4.8 was released 28 May 2026 by Anthropic. GPT-5 was released 7 Aug 2025 by OpenAI.
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