GPQA Diamond
Diamond / Independent evaluation ↗- Claude Opus 4.6:
- GPT-6 Astra:
Compare models
Find the right model, side by side.
Updated: Data as of:
First model
Second model
Model specifications
| Specifications |  Claude Opus 4.6Anthropic |  GPT-6 AstraOpenAI |
|---|---|---|
| Provider | ||
| Context sizetokens | 1,000,000 | 1,000,000 |
| Cutoff date | Not reported | 2026-04-30 |
| Input costUSD / 1M tokens | $5.00 | $10.00 |
| Output costUSD / 1M tokens | $25.00 | $50.00 |
| Max outputtokens | 128,000 | 128,000 |
| LatencyTTFT · seconds | 1.778 | 365.127 |
| Speedtokens / sec | 39.935 | 70.564 |
Benchmark performance
2 shared benchmark comparisons. Versions and setups matched.
Claude Opus 4.6GPT-6 Astra
Humanity’s Last Exam
Stable HLE — full set ↗Tools enabled- Claude Opus 4.6:
- GPT-6 Astra:
