# Claude Fable 5.1 vs GPT-4.1

As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in 6 of 6 shared categories: General LLM, Reasoning, Math, Long context, Factuality, and Abstraction (ARC).

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

GPT-4.1: $3.5 per 1M blended tokens.

Claude Fable 5.1: closed weights.

GPT-4.1: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in General LLM at #6 against #101.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in Reasoning at #5 against #102.
- Which to pick, Math: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in Math at #2 against #39.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in Long context at #6 against #95.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in Factuality at #1 against #103.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads GPT-4.1 in Abstraction (ARC) at #3 against #85.

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-4.1 is a former state-of-the-art holder in Long context (since May 11, 2025; sources LMArena Text (style-controlled, longer query); methodology v1.0).