Pyyan / Compare / Claude Fable 5.1 vs GPT-5.6 Sol
Claude Fable 5.1 vs GPT-5.6 Sol
2 of 5Language Models · verified 2 Sept 2026
Claude Fable 5.1Anthropiccurrent
GPT-5.6 SolOpenAIcurrent| Specification | Claude Fable 5.1 | GPT-5.6 Sol |
|---|---|---|
| Summary | Same price as Fable 5, and cache reads cost a quarter of what they did. | Flagship tier of the GPT-5.6 family. |
| Context | 1M | 1M+ |
| Input ($/Mtok) | $10 | — |
| Output ($/Mtok) | $50 | — |
| Licence | Proprietary | Proprietary |
| Max output | 128K | — |
| Parameters | Not published | — |
| Released | 1 Sep 2026 | 9 Jul 2026 |
| Model ID | claude-fable-5-1 | — |
| Category | Language Models | Language Models |
| Official | — | OpenAI ↗ |
Highlighted rows are where these differ.
Claude Fable 5.1
- Matches or beats Fable 5 at low and medium effort, and pulls clear at high effort
- Cache reads cut to 25% of the old price, so re-reading a long context got much cheaper
- Identical model to Mythos 5.1 underneath; the difference is the safeguards
Best for coding and long-running work.
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.