Claude Fable 5.1 vs o3-pro
Price and specs side by side · USD per 1M tokens · verified 2026-10-11
// side by side
| metric | Claude Fable 5.1 | o3-pro |
|---|
| input / 1M | $10.00 | $20.00 |
| output / 1M | $50.00 | $80.00 |
| blended (3:1) | $20.00 | $35.00 |
| cache read / 1M | $0.25 | — |
| context | 1M | 200K |
| max output | 128K | 100K |
| input types | text · image · pdf | text · image |
| reasoning | yes | yes |
| tool calling | yes | yes |
| structured output | yes | yes |
| open weights | no | no |
| released | 2026-09-01 | 2025-06-10 |
| knowledge cutoff | 2026-06 | 2024-05 |
| lab | Anthropic | OpenAI |
// monthly cost scenarios
| workload | tokens in / out | Claude Fable 5.1 | o3-pro |
|---|
| Chatbot | 10M / 2M | $200 | $360 |
| RAG app | 50M / 5M | $750 | $1,400 |
| Coding agent | 20M / 10M | $700 | $1,200 |
// verdict
- Claude Fable 5.1 is 42.9% cheaper than o3-pro on a blended 3:1 input/output basis.
- Claude Fable 5.1 has the larger context window (1M vs 200K tokens).