Claude Fable 5.1 vs GPT-6 Astra
Claude Fable 5.1 and GPT-6 Astra charge practically the same to read a 26.2K-token pull request ($0.2621). Above 272K tokens long-context rates apply, and Claude Fable 5.1 becomes the cheaper one. Both sit in the frontier price tier, so the choice between them is about review quality more than budget.
Side by side
| Figure | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Price tier | Frontier | Frontier |
| Typical review calllist price | $0.3829 | $0.3829 |
| Input / 1M tokens | $10.00 | $10.00 |
| Output / 1M tokens | $50.00 | $50.00 |
| Context window | 1M | 1.1M |
- Above 272K tokens, long-context rates mean Claude Fable 5.1 is the cheaper of the two.
Not benchmarked yet
Claude Fable 5.1 and GPT-6 Astra aren't benchmarked yet, so this page compares list prices only. Measured bugs caught, false alarms and a bug-by-bug comparison appear here once both have results.
See measured models