# Gemini 3.1 Pro Preview vs GLM 5.1

As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GLM 5.1 in 5 of 6 shared categories: General LLM, Reasoning, Science, Long context, and Factuality.

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

GLM 5.1: $1.4834999999999998 per 1M blended tokens.

Gemini 3.1 Pro Preview: closed weights.

GLM 5.1: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GLM 5.1 in General LLM at #15 against #37.
- Which to pick, Reasoning: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GLM 5.1 in Reasoning at #14 against #36.
- Which to pick, Science: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GLM 5.1 in Science at #7 against #35.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GLM 5.1 leads Gemini 3.1 Pro Preview in Coding › Web dev at #46 against #58.
- Which to pick, Long context: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GLM 5.1 in Long context at #12 against #36.
- Which to pick, Factuality: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads GLM 5.1 in Factuality at #18 against #38.

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, GLM 5.1 is a former state-of-the-art holder in Reasoning (since May 27, 2026; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).