Claude Fable 5.1 vs Claude Opus 4
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in 5 of 5 shared categories: General LLM, Reasoning, Math, Long context, and Abstraction (ARC).
Claude Fable 5.1
Yes. SOTA in co-SOTA in Factuality.
Claude Opus 4
It used to be. Was SOTA in Reasoning.
| Category | Claude Fable 5.1 | Claude Opus 4 |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #102 · #102 in General LLM Margin 69.38775510204081 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #97 · Was SOTA · Reasoning Margin 67.12328767123287 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #29 · #29 in Math Margin 62.22222222222222 Epoch AI benchmarking hub · May 22, 2025 |
| Science | — | #91 · #91 in Science Margin — Epoch AI benchmarking hub · May 22, 2025 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · May 22, 2025 |
| 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 | #70 · #70 in Long context Margin 47.61904761904762 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 | — |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #69 · #69 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 22, 2025 |
Claude Fable 5.1: $20 per 1M blended tokens.
Claude Opus 4: price per 1M tokens is unset in the catalog.
Claude Fable 5.1: closed weights.
Claude Opus 4: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in General LLM at #6 against #102.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in Reasoning at #5 against #97.
Math: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in Math at #2 against #29.
Long context: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in Long context at #6 against #70.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in Abstraction (ARC) at #3 against #69.
Claude Fable 5.1 · Claude Opus 4
Claude Fable 5.1 or Claude Opus 4?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in 5 of 5 shared categories: General LLM, Reasoning, Math, Long context, and Abstraction (ARC).
Claude Fable 5.1 or Claude Opus 4 for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in General LLM at #6 against #102.
Claude Fable 5.1 or Claude Opus 4 for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in Reasoning at #5 against #97.
Claude Fable 5.1 or Claude Opus 4 for Math?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Opus 4 in Math at #2 against #29.