# GPT-5.1 vs GPT-5.5

As of Oct 15, 2026, GPT-5.1 leads GPT-5.5 in 0 of 7 shared categories.

GPT-5.1: $3.4375000000000004 per 1M blended tokens.

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

GPT-5.1: closed weights.

GPT-5.5: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in General LLM at #21 against #47.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in Reasoning at #25 against #48.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in Science at #30 against #48.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in Coding › Web dev at #44 against #75.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in Long context at #23 against #54.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in Factuality at #5 against #37.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads GPT-5.1 in Abstraction (ARC) at #7 against #31.

As of Oct 15, 2026, GPT-5.1 is ranked #18 in Math (since Oct 15, 2026; sources Humanity's Last Exam; methodology v1.0).

As of Oct 15, 2026, GPT-5.5 is a former state-of-the-art holder in General LLM (since Apr 28, 2026; sources LMArena Text (style-controlled, overall); methodology v1.0).