# GLM 5.3 vs GPT-5.5

As of Oct 15, 2026, GLM 5.3 leads GPT-5.5 in 3 of 6 shared categories: Reasoning, Science, and Coding › Web dev.

GLM 5.3: $1.275 per 1M blended tokens.

GPT-5.5: $11.25 per 1M blended tokens.

GLM 5.3: open weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads GLM 5.3 in General LLM at #22 against #24.
- Which to pick, Reasoning: As of Oct 15, 2026, GLM 5.3 leads GPT-5.5 in Reasoning at #19 against #26.
- Which to pick, Science: As of Oct 15, 2026, GLM 5.3 leads GPT-5.5 in Science at #28 against #30.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GLM 5.3 leads GPT-5.5 in Coding › Web dev at #20 against #48.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 leads GLM 5.3 in Long context at #26 against #31.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads GLM 5.3 in Factuality at #5 against #31.

As of Oct 15, 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 15, 2026, GPT-5.5 is near state of the art, rank #5 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).