# Claude Fable 5.1 vs GPT-4O

As of Oct 15, 2026, Claude Fable 5.1 leads GPT-4O in 2 of 2 shared categories: Math and Abstraction (ARC).

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

GPT-4O: $4.375000000000001 per 1M blended tokens.

Claude Fable 5.1: closed weights.

GPT-4O: closed weights.

- Which to pick, Math: As of Oct 15, 2026, Claude Fable 5.1 leads GPT-4O in Math at #2 against #45.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5.1 leads GPT-4O in Abstraction (ARC) at #3 against #87.

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-4O is a former state-of-the-art holder in General LLM (since Aug 28, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).