GPT-5.6 Terra vs O3
As of Oct 15, 2026, GPT-5.6 Terra leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
GPT-5.6 Terra
#4 Best recorded rank: #4 in Abstraction (ARC), as of Oct 15, 2026.
O3
It used to be. Was SOTA in General LLM.
| Category | GPT-5.6 Terra | O3 |
|---|---|---|
| General LLM | #35 · #35 in General LLM Margin 23.80952380952381 LMArena leaderboard dataset · Oct 13, 2026 | #78 · Was SOTA · General LLM Margin 53.06122448979592 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #35 · #35 in Reasoning Margin 24.657534246575338 LMArena leaderboard dataset · Oct 13, 2026 | #90 · Was SOTA · Reasoning Margin 62.32876712328767 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #20 · Was SOTA · Math Margin 42.22222222222222 Epoch AI benchmarking hub · Apr 16, 2025 |
| Science | #15 · #15 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 | #67 · #67 in Science Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding | #13 · #13 in Coding Margin 63.63636363636363 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #13 · #13 in Coding › Agentic Margin 63.63636363636363 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 | — |
| Long context | #46 · #46 in Long context Margin 31.292517006802726 LMArena leaderboard dataset · Oct 13, 2026 | #110 · Was SOTA · Long context Margin 74.82993197278913 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #11 · #11 in Vision Margin 31.578947368421055 Epoch AI benchmarking hub · Jul 9, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #24 · #24 in Factuality Margin 18.656716417910445 LMArena leaderboard dataset · Oct 13, 2026 | #105 · #105 in Factuality Margin 79.1044776119403 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #4 · #4 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 | #37 · #37 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
GPT-5.6 Terra: $4.5 per 1M blended tokens.
O3: $3.5 per 1M blended tokens.
GPT-5.6 Terra: closed weights.
O3: closed weights.
General LLM: As of Oct 15, 2026, GPT-5.6 Terra leads O3 in General LLM at #35 against #78.
Reasoning: As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Reasoning at #35 against #90.
Science: As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Science at #15 against #67.
Long context: As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Long context at #46 against #110.
Factuality: As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Factuality at #24 against #105.
Abstraction (ARC): As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Abstraction (ARC) at #4 against #37.
GPT-5.6 Terra or O3?
As of Oct 15, 2026, GPT-5.6 Terra leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
GPT-5.6 Terra or O3 for General LLM?
As of Oct 15, 2026, GPT-5.6 Terra leads O3 in General LLM at #35 against #78.
GPT-5.6 Terra or O3 for Reasoning?
As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Reasoning at #35 against #90.
GPT-5.6 Terra or O3 for Science?
As of Oct 15, 2026, GPT-5.6 Terra leads O3 in Science at #15 against #67.