# Claude Fable 5.1 vs Gemini 2.5 Flash Preview 05.20

As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 2.5 Flash Preview 05.20 in 2 of 2 shared categories: Math and Abstraction (ARC).

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

Gemini 2.5 Flash Preview 05.20: price per 1M tokens is unset in the catalog.

Claude Fable 5.1: closed weights.

Gemini 2.5 Flash Preview 05.20: closed weights.

- Which to pick, Math: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 2.5 Flash Preview 05.20 in Math at #2 against #28.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 2.5 Flash Preview 05.20 in Abstraction (ARC) at #3 against #52.

As of Oct 14, 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 14, 2026, Gemini 2.5 Flash Preview 05.20 is ranked #28 in Math (since Oct 14, 2026; sources Humanity's Last Exam; methodology v1.0).