# GPT-4O vs GPT-5.5

As of Oct 15, 2026, GPT-4O leads GPT-5.5 in 0 of 2 shared categories.

GPT-4O: $4.375000000000001 per 1M blended tokens.

GPT-5.5: $11.25 per 1M blended tokens.

GPT-4O: closed weights.

GPT-5.5: closed weights.

- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads GPT-4O in Science at #30 against #131.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads GPT-4O in Abstraction (ARC) at #7 against #87.

As of Oct 15, 2026, GPT-4O is a former state-of-the-art holder in General LLM (since Aug 28, 2024; sources LMArena Text (style-controlled, overall); methodology v1.0).

As of Oct 15, 2026, GPT-5.5 is near state of the art, rank #5 in Factuality (since Oct 15, 2026; sources LMArena Text factuality; methodology v1.0).