# Claude Fable 5.1 vs GPT-5.4 Nano

As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.4 Nano in 5 of 5 shared categories: General LLM, Reasoning, Long context, Factuality, and Abstraction (ARC).

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

GPT-5.4 Nano: $0.4625 per 1M blended tokens.

Claude Fable 5.1: closed weights.

GPT-5.4 Nano: closed weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.4 Nano in General LLM at #6 against #114.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.4 Nano in Reasoning at #5 against #109.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.4 Nano in Long context at #6 against #120.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.4 Nano in Factuality at #1 against #98.
- Which to pick, Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.4 Nano in Abstraction (ARC) at #3 against #43.

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-5.4 Nano is ranked #43 in Abstraction (ARC) (since Oct 14, 2026; sources ARC-AGI; methodology v1.0).