# Claude Opus 5 vs GLM 5.1

As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in 6 of 6 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, and Factuality.

Claude Opus 5: $10 per 1M blended tokens.

GLM 5.1: $1.4834999999999998 per 1M blended tokens.

Claude Opus 5: closed weights.

GLM 5.1: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in General LLM at #11 against #37.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in Reasoning at #9 against #36.
- Which to pick, Science: As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in Science at #12 against #35.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in Coding › Web dev at #6 against #46.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in Long context at #9 against #36.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5 leads GLM 5.1 in Factuality at #4 against #38.

As of Oct 15, 2026, Claude Opus 5 is near state of the art, rank #4 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; 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).