Claude Fable 5.1 vs GPT-5.6 Terra
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Claude Fable 5.1 | GPT-5.6 Terra | |
|---|---|---|
| API model IDs | claude-fable-5-1 | gpt-5.6-terra |
| Context window | 1,000,000 | 1,050,000 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | no | on-request |
| Input per 1M tokens | $10 (verified 2026-09-08) | $2 (verified 2026-09-08) |