# Claude Opus 5 vs GLM 4.5 Air

As of Oct 15, 2026, Claude Opus 5 leads GLM 4.5 Air in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.

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

GLM 4.5 Air: $0.31 per 1M blended tokens.

Claude Opus 5: closed weights.

GLM 4.5 Air: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5 leads GLM 4.5 Air in General LLM at #11 against #183.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5 leads GLM 4.5 Air in Reasoning at #9 against #181.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5 leads GLM 4.5 Air in Long context at #9 against #179.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5 leads GLM 4.5 Air in Factuality at #4 against #145.

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 4.5 Air is ranked #32 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).