GPT-5.6 Terra vs GPT-6 Luna
As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in 9 of 10 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Long context, Vision, Factuality, and Abstraction (ARC).
GPT-5.6 Terra
#4 Best recorded rank: #4 in Abstraction (ARC), as of Oct 14, 2026.
GPT-6 Luna
Yes. Yes on Coding (best per dollar); Coding › Agentic (best per dollar). Not the overall leader.
| Category | GPT-5.6 Terra | GPT-6 Luna |
|---|---|---|
| General LLM | #35 · #35 in General LLM Margin 23.80952380952381 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in General LLM Margin 44.21768707482993 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #35 · #35 in Reasoning Margin 24.657534246575338 LMArena leaderboard dataset · Oct 13, 2026 | #61 · #61 in Reasoning Margin 42.465753424657535 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 | #15 · #15 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 | #33 · #33 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
| Coding | #13 · #13 in Coding Margin 63.63636363636363 Terminal-Bench Harbor Hub · Oct 6, 2026 | #17 · #17 in Coding Margin 81.81818181818181 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #13 · #13 in Coding › Agentic Margin 63.63636363636363 Terminal-Bench Harbor Hub · Oct 6, 2026 | #17 · #17 in Coding › Agentic Margin 81.81818181818181 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #42 · #42 in Coding › Web dev Margin 38.3177570093458 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in Coding › Web dev Margin 26.168224299065415 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #46 · #46 in Long context Margin 31.292517006802726 LMArena leaderboard dataset · Oct 13, 2026 | #61 · #61 in Long context Margin 41.49659863945578 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #11 · #11 in Vision Margin 31.578947368421055 Epoch AI benchmarking hub · Jul 9, 2026 | #17 · #17 in Vision Margin 47.36842105263158 Epoch AI benchmarking hub · Sep 22, 2026 |
| Factuality | #24 · #24 in Factuality Margin 18.656716417910445 LMArena leaderboard dataset · Oct 13, 2026 | #39 · #39 in Factuality Margin 29.85074626865672 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #4 · #4 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 | #22 · #22 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
GPT-5.6 Terra: $4.5 per 1M blended tokens.
GPT-6 Luna: $0.19999999999999998 per 1M blended tokens.
GPT-5.6 Terra: closed weights.
GPT-6 Luna: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in General LLM at #35 against #65.
Reasoning: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Reasoning at #35 against #61.
Science: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Science at #15 against #33.
Coding: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Coding at #13 against #17.
Coding › Agentic: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Coding › Agentic at #13 against #17.
Coding › Web dev: As of Oct 14, 2026, GPT-6 Luna leads GPT-5.6 Terra in Coding › Web dev at #29 against #42.
Long context: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Long context at #46 against #61.
Vision: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Vision at #11 against #17.
Factuality: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Factuality at #24 against #39.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Abstraction (ARC) at #4 against #22.
GPT-5.6 Terra or GPT-6 Luna?
As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in 9 of 10 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Long context, Vision, Factuality, and Abstraction (ARC).
GPT-5.6 Terra or GPT-6 Luna for General LLM?
As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in General LLM at #35 against #65.
GPT-5.6 Terra or GPT-6 Luna for Reasoning?
As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Reasoning at #35 against #61.
GPT-5.6 Terra or GPT-6 Luna for Science?
As of Oct 14, 2026, GPT-5.6 Terra leads GPT-6 Luna in Science at #15 against #33.