# Gemini 2.5 Flash Preview 05.20 vs Gemini 3.1 Pro Preview

As of Oct 15, 2026, Gemini 2.5 Flash Preview 05.20 leads Gemini 3.1 Pro Preview in 0 of 2 shared categories.

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

Gemini 3.1 Pro Preview: $4.5 per 1M blended tokens.

Gemini 2.5 Flash Preview 05.20: closed weights.

Gemini 3.1 Pro Preview: closed weights.

- Which to pick, Math: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Gemini 2.5 Flash Preview 05.20 in Math at #3 against #28.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Gemini 2.5 Flash Preview 05.20 in Abstraction (ARC) at #2 against #52.

As of Oct 15, 2026, Gemini 2.5 Flash Preview 05.20 is ranked #28 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).

As of Oct 15, 2026, Gemini 3.1 Pro Preview is state of the art on best per dollar in Math (since Oct 14, 2026; sources Humanity's Last Exam; methodology v1.0).