# Claude Fable 5.1 vs O3 Mini

As of Oct 15, 2026, Claude Fable 5.1 leads O3 Mini in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Abstraction (ARC).

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

O3 Mini: $1.9250000000000003 per 1M blended tokens.

Claude Fable 5.1: closed weights.

O3 Mini: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, Claude Fable 5.1 leads O3 Mini in General LLM at #6 against #7.
- Which to pick, Reasoning: As of Oct 15, 2026, Claude Fable 5.1 leads O3 Mini in Reasoning at #5 against #133.
- Which to pick, Long context: As of Oct 15, 2026, Claude Fable 5.1 leads O3 Mini in Long context at #6 against #145.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5.1 leads O3 Mini in Abstraction (ARC) at #3 against #51.

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).

As of Oct 15, 2026, O3 Mini is a former state-of-the-art holder in Reasoning (since Feb 9, 2025; sources LMArena Text (style-controlled, hard prompts); methodology v1.0).