Claude Fable 5 vs GPT-5.6 Luna
As of Oct 15, 2026, Claude Fable 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 Fable 5
Close. Near-SOTA in General LLM, rank #3.
GPT-5.6 Luna
#16 Best current rank: #16 in Coding, as of Oct 15, 2026.
| Category | Claude Fable 5 | GPT-5.6 Luna |
|---|---|---|
| General LLM | #3 · Near-SOTA · General LLM Margin 2.040816326530617 LMArena leaderboard dataset · Oct 13, 2026 | #53 · #53 in General LLM Margin 36.054421768707485 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #3 · Near-SOTA · Reasoning Margin 2.7397260273972535 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 | #56 · #56 in Science Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #25 · #25 in Science Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
| Coding | #6 · #6 in Coding Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #16 · #16 in Coding Margin 77.27272727272728 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #6 · #6 in Coding › Agentic Margin 31.818181818181813 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 | #17 · Was SOTA · Coding › Web dev Margin 14.953271028037378 LMArena leaderboard dataset · Oct 13, 2026 | #43 · #43 in Coding › Web dev Margin 39.25233644859813 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #3 · Near-SOTA · Long context Margin 2.040816326530603 LMArena leaderboard dataset · Oct 13, 2026 | #65 · #65 in Long context Margin 44.21768707482993 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #5 · Was SOTA · Vision Margin 15.78947368421052 Epoch AI benchmarking hub · Jun 9, 2026 | #19 · #19 in Vision Margin 52.63157894736842 Epoch AI benchmarking hub · Jul 9, 2026 |
| Factuality | #7 · Was SOTA · Factuality Margin 5.97014925373135 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 · Jun 9, 2026 | #19 · #19 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 9, 2026 |
Claude Fable 5: $20 per 1M blended tokens.
GPT-5.6 Luna: $0.44999999999999996 per 1M blended tokens.
Claude Fable 5: closed weights.
GPT-5.6 Luna: closed weights.
General LLM: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in General LLM at #3 against #53.
Reasoning: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Reasoning at #3 against #55.
Science: As of Oct 15, 2026, GPT-5.6 Luna leads Claude Fable 5 in Science at #25 against #56.
Coding: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Coding at #6 against #16.
Coding › Agentic: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Coding › Agentic at #6 against #16.
Coding › Web dev: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Coding › Web dev at #17 against #43.
Long context: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Long context at #3 against #65.
Vision: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Vision at #5 against #19.
Factuality: As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Factuality at #7 against #35.
Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Abstraction (ARC) at #1 against #19.
Claude Fable 5 or GPT-5.6 Luna?
As of Oct 15, 2026, Claude Fable 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 Fable 5 or GPT-5.6 Luna for General LLM?
As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in General LLM at #3 against #53.
Claude Fable 5 or GPT-5.6 Luna for Reasoning?
As of Oct 15, 2026, Claude Fable 5 leads GPT-5.6 Luna in Reasoning at #3 against #55.
Claude Fable 5 or GPT-5.6 Luna for Science?
As of Oct 15, 2026, GPT-5.6 Luna leads Claude Fable 5 in Science at #25 against #56.