# Claude Fable 5.1 vs Nvidia Nemotron 3 Ultra 550B A55b Nvfp4

As of Oct 14, 2026, Claude Fable 5.1 leads Nvidia Nemotron 3 Ultra 550B A55b Nvfp4 in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.

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

Nvidia Nemotron 3 Ultra 550B A55b Nvfp4: price per 1M tokens is unset in the catalog.

Claude Fable 5.1: closed weights.

Nvidia Nemotron 3 Ultra 550B A55b Nvfp4: open weights.

- Which to pick, General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Nvidia Nemotron 3 Ultra 550B A55b Nvfp4 in General LLM at #6 against #83.
- Which to pick, Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Nvidia Nemotron 3 Ultra 550B A55b Nvfp4 in Reasoning at #5 against #88.
- Which to pick, Long context: As of Oct 14, 2026, Claude Fable 5.1 leads Nvidia Nemotron 3 Ultra 550B A55b Nvfp4 in Long context at #6 against #89.
- Which to pick, Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads Nvidia Nemotron 3 Ultra 550B A55b Nvfp4 in Factuality at #1 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, Nvidia Nemotron 3 Ultra 550B A55b Nvfp4 is ranked #83 in General LLM (since Oct 14, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).