Pyyan / Compare / GPT-6 Astra vs Claude Fable 5
GPT-6 Astra vs Claude Fable 5
2 of 5Language Models · verified 5 Sept 2026
GPT-6 AstraOpenAIcurrentClaude Fable 5Anthropiccurrent
| Specification | GPT-6 Astra | Claude Fable 5 |
|---|---|---|
| Summary | Saturates three of the benchmarks it reports, and ships disabled for enterprise. | Most capable widely released model, for the hardest reasoning and long-horizon agentic work. |
| Context | 1.05M | 1M |
| Input ($/Mtok) | $10 | $10 |
| Output ($/Mtok) | $50 | $50 |
| Licence | Proprietary | Proprietary |
| Max output | 128K | 128K |
| Parameters | Not published | — |
| Released | 3 Sep 2026 | — |
| Model ID | gpt-6-astra | claude-fable-5 |
| Category | Language Models | Language Models |
| Official | — | Anthropic ↗ |
Highlighted rows are where these differ.
GPT-6 Astra
- 97.6% on FrontierMath Tier 4, 99.9% on ARC-AGI-3 and 100% on ExploitBench
- Above 272K input tokens the whole request reprices: input and cache at 2x, output at 1.5x
- Rolls out to OpenAI's Daybreak cyber programme first, and arrives switched off for enterprise
Best for hard reasoning and computer use.
Claude Fable 5
- Thinking is always on — the `thinking` param is rejected
- Raw chain of thought is never returned
- Requires 30-day data retention; unavailable under ZDR
Best for the hardest problems.