Claude Fable 5.1 vs GPT-6 Astra
Price and specs side by side · USD per 1M tokens · verified 2026-10-11
// side by side
| metric | Claude Fable 5.1 | GPT-6 Astra |
|---|
| input / 1M | $10.00 | $10.00 |
| output / 1M | $50.00 | $50.00 |
| blended (3:1) | $20.00 | $20.00 |
| cache read / 1M | $0.25 | $1.00 |
| context | 1M | 1.05M |
| max output | 128K | 128K |
| input types | text · image · pdf | text · image · pdf |
| reasoning | yes | yes |
| tool calling | yes | yes |
| structured output | yes | yes |
| open weights | no | no |
| released | 2026-09-01 | 2026-09-04 |
| knowledge cutoff | 2026-06 | 2026-04-30 |
| lab | Anthropic | OpenAI |
// monthly cost scenarios
| workload | tokens in / out | Claude Fable 5.1 | GPT-6 Astra |
|---|
| Chatbot | 10M / 2M | $200 | $200 |
| RAG app | 50M / 5M | $750 | $750 |
| Coding agent | 20M / 10M | $700 | $700 |
// verdict
- Claude Fable 5.1 and GPT-6 Astra have the same blended price.
- GPT-6 Astra has the larger context window (1.05M vs 1M tokens).