# Claude Fable 5.1 vs GLM 4.5 Air

As of Oct 14, 2026, Claude Fable 5.1 leads GLM 4.5 Air in 5 of 5 shared categories: General LLM, Reasoning, Math, Long context, and Factuality.

Claude Fable 5.1: $20 per 1M blended tokens.

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

Claude Fable 5.1: closed weights.

GLM 4.5 Air: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads GLM 4.5 Air in General LLM at #6 against #142.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads GLM 4.5 Air in Reasoning at #5 against #140.
- Which to pick, Math: As of Oct 14, 2026, Claude Fable 5.1 leads GLM 4.5 Air in Math at #2 against #32.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads GLM 4.5 Air in Long context at #6 against #138.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads GLM 4.5 Air in Factuality at #1 against #109.

As of Oct 14, 2026, Claude Fable 5.1 is tied for state of the art in Factuality (since Oct 2, 2026; sources LMArena Text factuality; methodology v1.0).

As of Oct 14, 2026, GLM 4.5 Air is ranked #32 in Math (since Oct 14, 2026; sources Humanity's Last Exam; methodology v1.0).