# Claude Sonnet 5.5 vs GLM 5.1

As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in 6 of 6 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, and Factuality.

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

GLM 5.1: $2.0425 per 1M blended tokens.

Claude Sonnet 5.5: closed weights.

GLM 5.1: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in General LLM at #27 against #37.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in Reasoning at #18 against #36.
- Which to pick, Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in Science at #3 against #35.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in Coding › Web dev at #3 against #46.
- Which to pick, Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in Long context at #11 against #36.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads GLM 5.1 in Factuality at #16 against #38.

As of Oct 14, 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 14, 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).