# Claude Fable 5.1 vs O1 Preview

As of Oct 14, 2026, Claude Fable 5.1 leads O1 Preview in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Abstraction (ARC).

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

O1 Preview: price per 1M tokens is unset in the catalog.

Claude Fable 5.1: closed weights.

O1 Preview: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads O1 Preview in General LLM at #6 against #129.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads O1 Preview in Reasoning at #5 against #137.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads O1 Preview in Long context at #6 against #135.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads O1 Preview in Abstraction (ARC) at #3 against #73.

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, O1 Preview is a former state-of-the-art holder in General LLM (since Sep 27, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).