Claude Fable 5.1 vs GPT-5.5
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in 7 of 7 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
| Category | Claude Fable 5.1 | GPT-5.5 |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | — | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #3 · Near-SOTA · Coding › Agentic Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #5 · Near-SOTA · Coding › Web dev Margin 3.738317757009341 LMArena leaderboard dataset · Oct 13, 2026 | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Was SOTA · Long context Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 |
Claude Fable 5.1: $20 per 1M blended tokens.
GPT-5.5: $11.25 per 1M blended tokens.
Claude Fable 5.1: closed weights.
GPT-5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in General LLM at #6 against #21.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Reasoning at #5 against #25.
Coding › Web dev: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Coding › Web dev at #5 against #44.
Long context: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Long context at #6 against #23.
Vision: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Vision at #6 against #10.
Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Factuality at #1 against #5.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Abstraction (ARC) at #3 against #7.
Claude Fable 5.1 or GPT-5.5?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in 7 of 7 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Fable 5.1 or GPT-5.5 for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in General LLM at #6 against #21.
Claude Fable 5.1 or GPT-5.5 for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Reasoning at #5 against #25.
Claude Fable 5.1 or GPT-5.5 for Coding › Web dev?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 in Coding › Web dev at #5 against #44.