Pyyan / Compare / Claude Fable 5 vs GPT-5.6 Sol
Claude Fable 5 vs GPT-5.6 Sol
2 of 5Language Models · verified 13 Aug 2026
Claude Fable 5Anthropiccurrent
GPT-5.6 SolOpenAIcurrent| Specification | Claude Fable 5 | GPT-5.6 Sol |
|---|---|---|
| Summary | Most capable widely released model, for the hardest reasoning and long-horizon agentic work. | Flagship tier of the GPT-5.6 family. |
| Context | 1M | 1M+ |
| Input ($/Mtok) | $10 | — |
| Output ($/Mtok) | $50 | — |
| Licence | Proprietary | Proprietary |
| Max output | 128K | — |
| Released | — | 9 Jul 2026 |
| Model ID | claude-fable-5 | — |
| Category | Language Models | Language Models |
| Official | Anthropic ↗ | OpenAI ↗ |
Highlighted rows are where these differ.
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.
GPT-5.6 Sol
- Three tiers: Sol, Terra, Luna
- Adjustable reasoning effort from none to max
- Broad rollout began 9 July 2026
Best for all-round work.