# Claude Opus 5.5 vs GLM 4.5 Air

As of Oct 15, 2026, Claude Opus 5.5 leads GLM 4.5 Air in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.

Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.

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

Claude Opus 5.5: closed weights.

GLM 4.5 Air: open weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 4.5 Air in General LLM at #2 against #183.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 4.5 Air in Reasoning at #1 against #181.
- Which to pick, Long context: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 4.5 Air in Long context at #1 against #179.
- Which to pick, Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads GLM 4.5 Air in Factuality at #1 against #145.

As of Oct 15, 2026, Claude Opus 5.5 is tied for state of the art in Reasoning (since Oct 2, 2026; sources LMArena Text (style-controlled, hard prompts); 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).