# Claude Fable 5.1 vs GPT-4.5 Preview

As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.5 Preview in 5 of 5 shared categories: General LLM, Reasoning, Math, Long context, and Abstraction (ARC).

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

GPT-4.5 Preview: price per 1M tokens is unset in the catalog.

Claude Fable 5.1: closed weights.

GPT-4.5 Preview: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.5 Preview in General LLM at #6 against #62.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.5 Preview in Reasoning at #5 against #93.
- Which to pick, Math: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.5 Preview in Math at #2 against #38.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.5 Preview in Long context at #6 against #76.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.5 Preview in Abstraction (ARC) at #3 against #83.

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, GPT-4.5 Preview is a former state-of-the-art holder in General LLM (since Oct 17, 2025; sources LMArena Text (style-controlled, overall); methodology v1.0).