# GPT-4.5 Preview vs GPT-5.5

As of Oct 15, 2026, GPT-4.5 Preview leads GPT-5.5 in 0 of 5 shared categories.

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

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

GPT-4.5 Preview: closed weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads GPT-4.5 Preview in General LLM at #22 against #79.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 leads GPT-4.5 Preview in Reasoning at #26 against #121.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads GPT-4.5 Preview in Science at #30 against #92.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 leads GPT-4.5 Preview in Long context at #26 against #93.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads GPT-4.5 Preview in Abstraction (ARC) at #7 against #83.

As of Oct 15, 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).

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).