GPT-5.5 vs GPT-5.6 Luna
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in 6 of 8 shared categories: General LLM, Reasoning, Long context, Vision, Factuality, and Abstraction (ARC).
GPT-5.5
It used to be. Was SOTA in General LLM.
GPT-5.6 Luna
#16 Best current rank: #16 in Coding, as of Oct 14, 2026.
| Category | GPT-5.5 | GPT-5.6 Luna |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #53 · #53 in General LLM Margin 36.054421768707485 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 | #55 · #55 in Reasoning Margin 38.35616438356164 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 | #25 · #25 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #16 · #16 in Coding Margin 77.27272727272728 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | — | #16 · #16 in Coding › Agentic Margin 77.27272727272728 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 | #43 · #43 in Coding › Web dev Margin 39.25233644859813 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in Long context Margin 44.21768707482993 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 | #19 · #19 in Vision Margin 52.63157894736842 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Factuality Margin 26.86567164179104 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 | #19 · #19 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
GPT-5.5: $11.25 per 1M blended tokens.
GPT-5.6 Luna: $0.44999999999999996 per 1M blended tokens.
GPT-5.5: closed weights.
GPT-5.6 Luna: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in General LLM at #21 against #53.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in Reasoning at #25 against #55.
Science: As of Oct 14, 2026, GPT-5.6 Luna leads GPT-5.5 in Science at #25 against #30.
Coding › Web dev: As of Oct 14, 2026, GPT-5.6 Luna leads GPT-5.5 in Coding › Web dev at #43 against #44.
Long context: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in Long context at #23 against #65.
Vision: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in Vision at #10 against #19.
Factuality: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in Factuality at #5 against #35.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in Abstraction (ARC) at #7 against #19.
GPT-5.5 or GPT-5.6 Luna?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in 6 of 8 shared categories: General LLM, Reasoning, Long context, Vision, Factuality, and Abstraction (ARC).
GPT-5.5 or GPT-5.6 Luna for General LLM?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in General LLM at #21 against #53.
GPT-5.5 or GPT-5.6 Luna for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Luna in Reasoning at #25 against #55.
GPT-5.5 or GPT-5.6 Luna for Science?
As of Oct 14, 2026, GPT-5.6 Luna leads GPT-5.5 in Science at #25 against #30.