Claude Opus 4.8 vs GPT-5.6 Luna
As of Oct 14, 2026, Claude Opus 4.8 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 4.8
It used to be. Was SOTA in Coding › Web dev.
GPT-5.6 Luna
#16 Best current rank: #16 in Coding, as of Oct 14, 2026.
| Category | Claude Opus 4.8 | GPT-5.6 Luna |
|---|---|---|
| General LLM | #20 · #20 in General LLM Margin 13.605442176870753 LMArena leaderboard dataset · Oct 13, 2026 | #53 · #53 in General LLM Margin 36.054421768707485 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 7.534246575342465 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 | #27 · #27 in Science Margin — Epoch AI benchmarking hub · May 28, 2026 | #25 · #25 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
| Coding | #12 · #12 in Coding Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | #16 · #16 in Coding Margin 77.27272727272728 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #12 · #12 in Coding › Agentic Margin 59.09090909090909 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 | #33 · Was SOTA · Coding › Web dev Margin 29.90654205607477 LMArena leaderboard dataset · Oct 13, 2026 | #43 · #43 in Coding › Web dev Margin 39.25233644859813 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #10 · Was SOTA · Long context Margin 6.802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in Long context Margin 44.21768707482993 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | #19 · #19 in Vision Margin 52.63157894736842 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #21 · #21 in Factuality Margin 16.417910447761187 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Factuality Margin 26.86567164179104 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 | #19 · #19 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
Claude Opus 4.8: $10 per 1M blended tokens.
GPT-5.6 Luna: $0.44999999999999996 per 1M blended tokens.
Claude Opus 4.8: closed weights.
GPT-5.6 Luna: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in General LLM at #20 against #53.
Reasoning: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Reasoning at #10 against #55.
Science: As of Oct 14, 2026, GPT-5.6 Luna leads Claude Opus 4.8 in Science at #25 against #27.
Coding: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Coding at #12 against #16.
Coding › Agentic: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Coding › Agentic at #12 against #16.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Coding › Web dev at #33 against #43.
Long context: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Long context at #10 against #65.
Vision: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Vision at #13 against #19.
Factuality: As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Factuality at #21 against #35.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Abstraction (ARC) at #12 against #19.
Claude Opus 4.8 · GPT-5.6 Luna
Claude Opus 4.8 or GPT-5.6 Luna?
As of Oct 14, 2026, Claude Opus 4.8 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 4.8 or GPT-5.6 Luna for General LLM?
As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in General LLM at #20 against #53.
Claude Opus 4.8 or GPT-5.6 Luna for Reasoning?
As of Oct 14, 2026, Claude Opus 4.8 leads GPT-5.6 Luna in Reasoning at #10 against #55.
Claude Opus 4.8 or GPT-5.6 Luna for Science?
As of Oct 14, 2026, GPT-5.6 Luna leads Claude Opus 4.8 in Science at #25 against #27.