# Claude Fable 5.1 vs Claude Sonnet 5.5

As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 5.5 in 5 of 9 shared categories: General LLM, Reasoning, Math, Long context, and Factuality.

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

Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.

Claude Fable 5.1: closed weights.

Claude Sonnet 5.5: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 5.5 in General LLM at #6 against #27.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 5.5 in Reasoning at #5 against #18.
- Which to pick, Math: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 5.5 in Math at #2 against #4.
- Which to pick, Coding: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Fable 5.1 in Coding at #1 against #3.
- Which to pick, Coding › Agentic: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Fable 5.1 in Coding › Agentic at #1 against #3.
- Which to pick, Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Fable 5.1 in Coding › Web dev at #3 against #5.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 5.5 in Long context at #6 against #11.
- Which to pick, Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads Claude Fable 5.1 in Vision at #1 against #6.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 5.5 in Factuality at #1 against #16.

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 5.5 is tied for state of the art in Coding (since Oct 6, 2026; sources Terminal-Bench 4.0; methodology v1.0).