Claude Opus 5.5 vs GPT-5.6 Luna
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in 9 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
GPT-5.6 Luna
#16 Best current rank: #16 in Coding, as of Oct 14, 2026.
| Category | Claude Opus 5.5 | GPT-5.6 Luna |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #53 · #53 in General LLM Margin 36.054421768707485 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 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 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #25 · #25 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #16 · #16 in Coding Margin 77.27272727272728 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #16 · #16 in Coding › Agentic Margin 77.27272727272728 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #43 · #43 in Coding › Web dev Margin 39.25233644859813 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in Long context Margin 44.21768707482993 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #19 · #19 in Vision Margin 52.63157894736842 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Factuality Margin 26.86567164179104 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #19 · #19 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
GPT-5.6 Luna: $0.44999999999999996 per 1M blended tokens.
Claude Opus 5.5: closed weights.
GPT-5.6 Luna: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in General LLM at #2 against #53.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Reasoning at #1 against #55.
Science: As of Oct 14, 2026, GPT-5.6 Luna leads Claude Opus 5.5 in Science at #25 against #31.
Coding: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Coding at #1 against #16.
Coding › Agentic: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Coding › Agentic at #1 against #16.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Coding › Web dev at #1 against #43.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Long context at #1 against #65.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Vision at #4 against #19.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Factuality at #1 against #35.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Abstraction (ARC) at #1 against #19.
Claude Opus 5.5 · GPT-5.6 Luna
Claude Opus 5.5 or GPT-5.6 Luna?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in 9 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or GPT-5.6 Luna for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in General LLM at #2 against #53.
Claude Opus 5.5 or GPT-5.6 Luna for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5.6 Luna in Reasoning at #1 against #55.
Claude Opus 5.5 or GPT-5.6 Luna for Science?
As of Oct 14, 2026, GPT-5.6 Luna leads Claude Opus 5.5 in Science at #25 against #31.