# GLM 5.3 vs O3 Mini

As of Oct 14, 2026, GLM 5.3 leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.

GLM 5.3: $1.2592499999999998 per 1M blended tokens.

O3 Mini: $1.9250000000000003 per 1M blended tokens.

GLM 5.3: open weights.

O3 Mini: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, O3 Mini leads GLM 5.3 in General LLM at #7 against #23.
- Which to pick, Reasoning: As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Reasoning at #19 against #133.
- Which to pick, Science: As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Science at #28 against #76.
- Which to pick, Long context: As of Oct 14, 2026, GLM 5.3 leads O3 Mini in Long context at #27 against #145.

As of Oct 14, 2026, GLM 5.3 is tied for state of the art in General LLM (since Oct 13, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 14, 2026, O3 Mini is a former state-of-the-art holder in Reasoning (since Feb 9, 2025; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).