Claude Opus 5.5 (Canary Checkpoint) vs GPT-6 Astra
A direct, empirical evaluation of Claude Opus 5.5 (Canary Checkpoint) (Anthropic) against GPT-6 Astra (OpenAI).
Claude Opus 5.5 (Canary Checkpoint)
Developed by Anthropic · Frontier Mixture-of-Experts Architecture parameters
Autonomous repository issue resolution (81.4% SWE-bench Verified), native 3D glTF/OBJ mesh synthesis, and sub-300ms time-to-first-token.
GPT-6 Astra
Developed by OpenAI · Proprietary Frontier parameters
Complex multi-step engineering, formal math proofs, autonomous computer/browser navigation, and CAD synthesis.
| Metric | Claude Opus 5.5 (Canary Checkpoint) | GPT-6 Astra |
|---|---|---|
| SWE-bench Verified | 81.4% | 79.4% |
| MMLU-Pro | 94.2% | 91.2% |
| MATH-500 | 97.9% | 98.6% |
| Context Window | 1,000,000 tokens | 1,050,000 tokens |
| Input Pricing (per 1M) | $5.00 | $10.00 |
| Output Pricing (per 1M) | $25.00 | $50.00 |