Claude Fable 5 vs GPT-5.6 Luna
For product management work, compared on the PM Index.
- Claude Fable 5 leads on the PM Index (60.1 vs 52.1).
- GPT-5.6 Luna is cheaper ($2.25 vs $20.00 per 1M tokens).
- GPT-5.6 Luna is faster (204 vs 63 tok/s).
| Metric | Claude Fable 5 | GPT-5.6 Luna |
|---|---|---|
| PM Index | 60.1 | 52.1 |
| AA Intelligence | 59.9 | 51.2 |
| AA Coding | 76.5 | 71.4 |
| AA Agentic | 52.8 | 45.6 |
| Blended $/1M | $20.00 | $2.25 |
| Output tok/s | 63 | 204 |