Claude Fable 5.1 vs Claude Opus 4.1
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in 6 of 6 shared categories: General LLM, Reasoning, Math, Coding › Web dev, Long context, and Factuality.
Claude Fable 5.1
Yes. SOTA in Factuality (tied).
Claude Opus 4.1
It used to be. Was SOTA in General LLM.
| Category | Claude Fable 5.1 | Claude Opus 4.1 |
|---|---|---|
| General LLM | #6 · Near-SOTA · General LLM Margin 3.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 | #73 · Was SOTA · General LLM Margin 38.829787234042556 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Near-SOTA · Reasoning Margin 3.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 | #60 · Was SOTA · Reasoning Margin 32.44680851063829 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #27 · #27 in Math Margin 57.77777777777778 Epoch AI benchmarking hub · Aug 5, 2025 |
| Science | — | #83 · #83 in Science Margin — Epoch AI benchmarking hub · Aug 5, 2025 |
| 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 3.200000000000003 LMArena leaderboard dataset · Oct 13, 2026 | #84 · Was SOTA · Coding › Web dev Margin 66.4 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Near-SOTA · Long context Margin 3.1914893617021107 LMArena leaderboard dataset · Oct 13, 2026 | #52 · Was SOTA · Long context Margin 27.65957446808511 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #93 · #93 in Factuality Margin 54.651162790697676 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.
Claude Opus 4.1: $29.999999999999996 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Claude Opus 4.1: closed weights.
General LLM: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in General LLM at #6 against #73.
Reasoning: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Reasoning at #5 against #60.
Math: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Math at #2 against #27.
Coding › Web dev: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Coding › Web dev at #5 against #84.
Long context: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Long context at #6 against #52.
Factuality: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Factuality at #1 against #93.
Claude Fable 5.1 · Claude Opus 4.1
Claude Fable 5.1 or Claude Opus 4.1?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in 6 of 6 shared categories: General LLM, Reasoning, Math, Coding › Web dev, Long context, and Factuality.
Claude Fable 5.1 or Claude Opus 4.1 for General LLM?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in General LLM at #6 against #73.
Claude Fable 5.1 or Claude Opus 4.1 for Reasoning?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Reasoning at #5 against #60.
Claude Fable 5.1 or Claude Opus 4.1 for Math?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.1 in Math at #2 against #27.