GPT-5.5 vs GPT-5.6 Terra
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in 5 of 8 shared categories: General LLM, Reasoning, Long context, Vision, and Factuality.
GPT-5.5
It used to be. Was SOTA in General LLM.
GPT-5.6 Terra
#4 Best recorded rank: #4 in Abstraction (ARC), as of Oct 14, 2026.
| Category | GPT-5.5 | GPT-5.6 Terra |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in General LLM Margin 23.80952380952381 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Reasoning Margin 24.657534246575338 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 | #15 · #15 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #13 · #13 in Coding Margin 63.63636363636363 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | — | #13 · #13 in Coding › Agentic Margin 63.63636363636363 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 | #42 · #42 in Coding › Web dev Margin 38.3177570093458 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #46 · #46 in Long context Margin 31.292517006802726 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 | #11 · #11 in Vision Margin 31.578947368421055 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 | #24 · #24 in Factuality Margin 18.656716417910445 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 | #4 · #4 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
GPT-5.5: $11.25 per 1M blended tokens.
GPT-5.6 Terra: $4.5 per 1M blended tokens.
GPT-5.5: closed weights.
GPT-5.6 Terra: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in General LLM at #21 against #35.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Reasoning at #25 against #35.
Science: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Science at #15 against #30.
Coding › Web dev: As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Coding › Web dev at #42 against #44.
Long context: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Long context at #23 against #46.
Vision: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Vision at #10 against #11.
Factuality: As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Factuality at #5 against #24.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Abstraction (ARC) at #4 against #7.
GPT-5.5 or GPT-5.6 Terra?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in 5 of 8 shared categories: General LLM, Reasoning, Long context, Vision, and Factuality.
GPT-5.5 or GPT-5.6 Terra for General LLM?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in General LLM at #21 against #35.
GPT-5.5 or GPT-5.6 Terra for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads GPT-5.6 Terra in Reasoning at #25 against #35.
GPT-5.5 or GPT-5.6 Terra for Science?
As of Oct 14, 2026, GPT-5.6 Terra leads GPT-5.5 in Science at #15 against #30.