# Claude Sonnet 5.5 vs GLM 5.3

As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in 7 of 8 shared categories: Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, and Factuality.

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

GLM 5.3: $1.275 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

GLM 5.3: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, GLM 5.3 leads Claude Sonnet 5.5 in General LLM at #24 against #29.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Reasoning at #18 against #19.
- Which to pick, Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Science at #3 against #28.
- Which to pick, Coding: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Coding at #1 against #7.
- Which to pick, Coding › Agentic: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Coding › Agentic at #1 against #7.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Coding › Web dev at #3 against #20.
- Which to pick, Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Long context at #11 against #31.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads GLM 5.3 in Factuality at #17 against #31.

As of Oct 15, 2026, Claude Sonnet 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).

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).