GPT-6 Astra vs Claude Fable 5.1
GPT-6 Astra is the cheaper option on input; GPT-6 Astra is cheaper on output. Figures below are per million tokens, from vendor pricing cited in our reporting.
| GPT-6 Astra | Claude Fable 5.1 | |
|---|---|---|
| Input per 1M tokens | $10 | $10 |
| Output per 1M tokens | $50 | $50 |
| Cached input per 1M | — | $0.25 |
| Context window | — | — |
| Parameters | — | — |
| Licence | proprietary | proprietary |
| Benchmark | Artificial Analysis Intelligence Index: 61 | — |
| Vendor | OpenAI | Anthropic |
| Released | 3 Sept 2026 | 14 Sept 2026 |
What the numbers say
- Input price gap: 0% ($10 vs $10).
- Blended three-to-one input/output rate: $80.00 for GPT-6 Astra, $80.00 for Claude Fable 5.1.
- Context: — against —.
- Licence: GPT-6 Astra is proprietary; Claude Fable 5.1 is proprietary.
Sources
GPT-6 Astra specs · Claude Fable 5.1 specs · Full price index