# GPT-5.5 vs GPT-6 Luna

As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in 7 of 8 shared categories: General LLM, Reasoning, Science, Long context, Vision, Factuality, and Abstraction (ARC).

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

GPT-6 Luna: $0.19999999999999998 per 1M blended tokens.

GPT-5.5: closed weights.

GPT-6 Luna: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in General LLM at #21 against #65.
- Which to pick, Reasoning: As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in Reasoning at #25 against #61.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in Science at #30 against #33.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GPT-6 Luna leads GPT-5.5 in Coding › Web dev at #29 against #44.
- Which to pick, Long context: As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in Long context at #23 against #61.
- Which to pick, Vision: As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in Vision at #10 against #17.
- Which to pick, Factuality: As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in Factuality at #5 against #39.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GPT-5.5 leads GPT-6 Luna in Abstraction (ARC) at #7 against #22.

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).

As of Oct 15, 2026, GPT-6 Luna is state of the art on best per dollar in Coding (since Oct 14, 2026; sources Terminal-Bench 4.0; methodology v1.0).