Claude Opus 4.5 vs GPT-5.6 Terra
As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in 3 of 7 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 4.5
It used to be. Was SOTA in Reasoning.
GPT-5.6 Terra
#4 Best recorded rank: #4 in Abstraction (ARC), as of Oct 14, 2026.
| Category | Claude Opus 4.5 | GPT-5.6 Terra |
|---|---|---|
| General LLM | #33 · #33 in General LLM Margin 22.448979591836732 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in General LLM Margin 23.80952380952381 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #28 · Was SOTA · Reasoning Margin 19.86301369863014 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Reasoning Margin 24.657534246575338 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #16 · #16 in Math Margin 33.33333333333333 Epoch AI benchmarking hub · Nov 24, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #68 · #68 in Science Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #15 · #15 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #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 | #53 · Was SOTA · Coding › Web dev Margin 48.598130841121495 LMArena leaderboard dataset · Oct 13, 2026 | #42 · #42 in Coding › Web dev Margin 38.3177570093458 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #19 · Was SOTA · Long context Margin 12.925170068027214 LMArena leaderboard dataset · Oct 13, 2026 | #46 · #46 in Long context Margin 31.292517006802726 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | — | #11 · #11 in Vision Margin 31.578947368421055 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #36 · #36 in Factuality Margin 27.611940298507463 LMArena leaderboard dataset · Oct 13, 2026 | #24 · #24 in Factuality Margin 18.656716417910445 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #49 · #49 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #4 · #4 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
Claude Opus 4.5: $10 per 1M blended tokens.
GPT-5.6 Terra: $4.5 per 1M blended tokens.
Claude Opus 4.5: closed weights.
GPT-5.6 Terra: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in General LLM at #33 against #35.
Reasoning: As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in Reasoning at #28 against #35.
Science: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Opus 4.5 in Science at #15 against #68.
Coding › Web dev: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Opus 4.5 in Coding › Web dev at #42 against #53.
Long context: As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in Long context at #19 against #46.
Factuality: As of Oct 14, 2026, GPT-5.6 Terra leads Claude Opus 4.5 in Factuality at #24 against #36.
Abstraction (ARC): As of Oct 14, 2026, GPT-5.6 Terra leads Claude Opus 4.5 in Abstraction (ARC) at #4 against #49.
Claude Opus 4.5 · GPT-5.6 Terra
Claude Opus 4.5 or GPT-5.6 Terra?
As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in 3 of 7 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 4.5 or GPT-5.6 Terra for General LLM?
As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in General LLM at #33 against #35.
Claude Opus 4.5 or GPT-5.6 Terra for Reasoning?
As of Oct 14, 2026, Claude Opus 4.5 leads GPT-5.6 Terra in Reasoning at #28 against #35.
Claude Opus 4.5 or GPT-5.6 Terra for Science?
As of Oct 14, 2026, GPT-5.6 Terra leads Claude Opus 4.5 in Science at #15 against #68.