Claude Fable 5.1 vs Claude Sonnet 4.5
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Math, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Fable 5.1
Yes. SOTA in co-SOTA in Factuality.
Claude Sonnet 4.5
It used to be. Was SOTA in General LLM.
| Category | Claude Fable 5.1 | Claude Sonnet 4.5 |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #49 · Was SOTA · General LLM Margin 33.33333333333333 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #40 · Was SOTA · Reasoning Margin 28.082191780821915 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #25 · #25 in Math Margin 53.333333333333336 Epoch AI benchmarking hub · Sep 29, 2025 |
| Science | — | #82 · #82 in Science Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 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 | #78 · Was SOTA · Coding › Web dev Margin 71.96261682242991 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Was SOTA · Long context Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #29 · Was SOTA · Long context Margin 19.72789115646259 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 | #50 · #50 in Factuality Margin 38.059701492537314 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #66 · #66 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
Claude Fable 5.1: $20 per 1M blended tokens.
Claude Sonnet 4.5: $6 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Claude Sonnet 4.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in General LLM at #6 against #49.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Reasoning at #5 against #40.
Math: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Math at #2 against #25.
Coding › Web dev: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Coding › Web dev at #5 against #78.
Long context: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Long context at #6 against #29.
Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Factuality at #1 against #50.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Abstraction (ARC) at #3 against #66.
Claude Fable 5.1 · Claude Sonnet 4.5
Claude Fable 5.1 or Claude Sonnet 4.5?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Math, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Fable 5.1 or Claude Sonnet 4.5 for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in General LLM at #6 against #49.
Claude Fable 5.1 or Claude Sonnet 4.5 for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Reasoning at #5 against #40.
Claude Fable 5.1 or Claude Sonnet 4.5 for Math?
As of Oct 14, 2026, Claude Fable 5.1 leads Claude Sonnet 4.5 in Math at #2 against #25.