# Claude 3.5 Sonnet vs Claude Fable 5.1

As of Oct 15, 2026, Claude 3.5 Sonnet leads Claude Fable 5.1 in 0 of 4 shared categories.

Claude 3.5 Sonnet: price per 1M tokens is unset in the catalog.

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

Claude 3.5 Sonnet: closed weights.

Claude Fable 5.1: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Fable 5.1 leads Claude 3.5 Sonnet in General LLM at #6 against #181.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Fable 5.1 leads Claude 3.5 Sonnet in Reasoning at #5 against #175.
- Which to pick, Math: As of Oct 15, 2026, Claude Fable 5.1 leads Claude 3.5 Sonnet in Math at #2 against #43.
- Which to pick, Long context: As of Oct 15, 2026, Claude Fable 5.1 leads Claude 3.5 Sonnet in Long context at #6 against #163.

As of Oct 15, 2026, Claude 3.5 Sonnet is a former state-of-the-art holder in General LLM (since Aug 28, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 15, 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).