Claude Fable 5.1 vs Claude Opus 5.5
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 5.5 in 0 of 9 shared categories.
Claude Fable 5.1
Yes. SOTA in co-SOTA in Factuality.
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
| Category | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Reasoning Margin 0 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 | — | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #3 · Near-SOTA · Coding › Agentic Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding › Agentic Margin 0 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 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Was SOTA · Long context Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 |
Claude Fable 5.1: $20 per 1M blended tokens.
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Claude Opus 5.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in General LLM at #2 against #6.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Reasoning at #1 against #5.
Coding: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Coding at #1 against #3.
Coding › Agentic: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Coding › Agentic at #1 against #3.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Coding › Web dev at #1 against #5.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Long context at #1 against #6.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Vision at #4 against #6.
Factuality: As of Oct 14, 2026, Claude Fable 5.1 and Claude Opus 5.5 share #1 in Factuality.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Abstraction (ARC) at #1 against #3.
Claude Fable 5.1 · Claude Opus 5.5
Claude Fable 5.1 or Claude Opus 5.5?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 5.5 in 0 of 9 shared categories.
Claude Fable 5.1 or Claude Opus 5.5 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in General LLM at #2 against #6.
Claude Fable 5.1 or Claude Opus 5.5 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Reasoning at #1 against #5.
Claude Fable 5.1 or Claude Opus 5.5 for Coding?
As of Oct 14, 2026, Claude Opus 5.5 leads Claude Fable 5.1 in Coding at #1 against #3.