Claude Fable 5.1 vs GPT-5.5 Instant
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Fable 5.1
Yes. SOTA in co-SOTA in Factuality.
GPT-5.5 Instant
#31 Best current rank: #31 in General LLM, as of Oct 14, 2026.
| Category | Claude Fable 5.1 | GPT-5.5 Instant |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #31 · #31 in General LLM Margin 21.088435374149654 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Reasoning Margin 23.28767123287672 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 | — | #65 · #65 in Science Margin — Epoch AI benchmarking hub · May 5, 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 | — |
| Long context | #6 · Was SOTA · Long context Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #39 · #39 in Long context Margin 26.530612244897952 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #64 · #64 in Factuality Margin 48.507462686567166 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | — |
Claude Fable 5.1: $20 per 1M blended tokens.
GPT-5.5 Instant: price per 1M tokens is unset in the catalog.
Claude Fable 5.1: closed weights.
GPT-5.5 Instant: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in General LLM at #6 against #31.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in Reasoning at #5 against #33.
Long context: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in Long context at #6 against #39.
Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in Factuality at #1 against #64.
Claude Fable 5.1 · GPT-5.5 Instant
Claude Fable 5.1 or GPT-5.5 Instant?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Fable 5.1 or GPT-5.5 Instant for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in General LLM at #6 against #31.
Claude Fable 5.1 or GPT-5.5 Instant for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in Reasoning at #5 against #33.
Claude Fable 5.1 or GPT-5.5 Instant for Long context?
As of Oct 14, 2026, Claude Fable 5.1 leads GPT-5.5 Instant in Long context at #6 against #39.