# Claude Fable 5.1 vs Claude Sonnet 4.5

As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Math, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).

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

Claude Sonnet 4.5: $6 per 1M blended tokens.

Claude Fable 5.1: closed weights.

Claude Sonnet 4.5: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in General LLM at #6 against #49.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Reasoning at #5 against #40.
- Which to pick, Math: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Math at #2 against #25.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Coding › Web dev at #5 against #78.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Long context at #6 against #29.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Factuality at #1 against #50.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Abstraction (ARC) at #3 against #66.

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, Claude Sonnet 4.5 is a former state-of-the-art holder in General LLM (since Oct 3, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).