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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 5.1GPT-5.6 Terra
API model IDsclaude-fable-5-1gpt-5.6-terra
Context window1,000,0001,050,000
Lifecycleactiveactive
Licenseproprietaryproprietary
Trains on API dataNoNo
Zero data retentionnoon-request
Input per 1M tokens$10 (verified 2026-09-08)$2 (verified 2026-09-08)