# Claude Fable 5.1 vs GPT-5 Pro

As of Oct 15, 2026, Claude Fable 5.1 leads GPT-5 Pro in 2 of 2 shared categories: Math and Abstraction (ARC).

Claude Fable 5.1: $20 per 1M blended tokens.

GPT-5 Pro: $41.25 per 1M blended tokens.

Claude Fable 5.1: closed weights.

GPT-5 Pro: closed weights.

- Which to pick, Math: As of Oct 15, 2026, Claude Fable 5.1 leads GPT-5 Pro in Math at #2 against #12.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5.1 leads GPT-5 Pro in Abstraction (ARC) at #3 against #32.

As of Oct 15, 2026, Claude Fable 5.1 is tied for state of the art in Factuality (since Oct 2, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 15, 2026, GPT-5 Pro is a former state-of-the-art holder in Math (since Nov 24, 2025; sources Humanity's Last Exam; methodology v1.0).