Claude Fable 5.1 vs GPT-5.3-Codex
| Claude Fable 5.1 | GPT-5.3-Codex | |
|---|---|---|
| Coding index | 84.2 | 60.0 |
| Benchmarks behind it | Verified, 5 benchmarks | Verified, 3 benchmarks |
| Output $/Mtok | $50.00 | $14.00 |
| Cost per solved task | Not computable | $0.59 |
| Context window | 1M | 400K |
| Claude Fable 5.1 | GPT-5.3-Codex | |
|---|---|---|
| Coding index | 84.2 | 60.0 |
| Benchmarks behind it | Verified, 5 benchmarks | Verified, 3 benchmarks |
| Output $/Mtok | $50.00 | $14.00 |
| Cost per solved task | Not computable | $0.59 |
| Context window | 1M | 400K |