Claude Fable 5.1 vs Claude Sonnet 4
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 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 Sonnet 4
#35 Best current rank: #35 in Math, as of Oct 14, 2026.
| Category | Claude Fable 5.1 | Claude Sonnet 4 |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #126 · #126 in General LLM Margin 85.71428571428571 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #115 · #115 in Reasoning Margin 79.45205479452055 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #35 · #35 in Math Margin 77.77777777777777 Epoch AI benchmarking hub · May 22, 2025 |
| Science | — | #97 · #97 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 — 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 | #94 · #94 in Long context Margin 63.945578231292515 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 | #67 · #67 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 22, 2025 |
Claude Fable 5.1: $20 per 1M blended tokens.
Claude Sonnet 4: $6 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Claude Sonnet 4: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in General LLM at #6 against #126.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in Reasoning at #5 against #115.
Math: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in Math at #2 against #35.
Long context: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in Long context at #6 against #94.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in Abstraction (ARC) at #3 against #67.
Claude Fable 5.1 · Claude Sonnet 4
Claude Fable 5.1 or Claude Sonnet 4?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in 5 of 5 shared categories: General LLM, Reasoning, Math, Long context, and Abstraction (ARC).
Claude Fable 5.1 or Claude Sonnet 4 for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in General LLM at #6 against #126.
Claude Fable 5.1 or Claude Sonnet 4 for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in Reasoning at #5 against #115.
Claude Fable 5.1 or Claude Sonnet 4 for Math?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4 in Math at #2 against #35.