# Gemini 3.1 Pro Preview vs GPT-5 Nano

As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GPT-5 Nano in 2 of 2 shared categories: Science and Abstraction (ARC).

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

GPT-5 Nano: $0.1375 per 1M blended tokens.

Gemini 3.1 Pro Preview: closed weights.

GPT-5 Nano: closed weights.

- Which to pick, Science: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GPT-5 Nano in Science at #7 against #89.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GPT-5 Nano in Abstraction (ARC) at #2 against #72.

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).

As of Oct 15, 2026, GPT-5 Nano is ranked #72 in Abstraction (ARC) (since Oct 15, 2026; sources ARC-AGI; methodology v1.0).