Claude Sonnet 5.5 vs GPT-5.6 Luna
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in 9 of 9 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
GPT-5.6 Luna
#16 Best current rank: #16 in Coding, as of Oct 14, 2026.
| Category | Claude Sonnet 5.5 | GPT-5.6 Luna |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #53 · #53 in General LLM Margin 36.054421768707485 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #55 · #55 in Reasoning Margin 38.35616438356164 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 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 | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | #43 · #43 in Coding › Web dev Margin 39.25233644859813 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in Long context Margin 44.21768707482993 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #19 · #19 in Vision Margin 52.63157894736842 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Factuality Margin 26.86567164179104 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #19 · #19 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
GPT-5.6 Luna: $0.44999999999999996 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
GPT-5.6 Luna: closed weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in General LLM at #27 against #53.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Reasoning at #18 against #55.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Science at #3 against #25.
Coding: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Coding at #1 against #16.
Coding › Agentic: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Coding › Agentic at #1 against #16.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Coding › Web dev at #3 against #43.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Long context at #11 against #65.
Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Vision at #1 against #19.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Factuality at #16 against #35.
Claude Sonnet 5.5 · GPT-5.6 Luna
Claude Sonnet 5.5 or GPT-5.6 Luna?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in 9 of 9 shared categories: General LLM, Reasoning, Science, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5 or GPT-5.6 Luna for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in General LLM at #27 against #53.
Claude Sonnet 5.5 or GPT-5.6 Luna for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Reasoning at #18 against #55.
Claude Sonnet 5.5 or GPT-5.6 Luna for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads GPT-5.6 Luna in Science at #3 against #25.