Claude Fable 5 vs Claude Sonnet 4.5
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Fable 5
Close. Near-SOTA in General LLM, rank #3.
Claude Sonnet 4.5
It used to be. Was SOTA in General LLM.
| Category | Claude Fable 5 | Claude Sonnet 4.5 |
|---|---|---|
| General LLM | #3 · Near-SOTA · General LLM Margin 2.040816326530617 LMArena leaderboard dataset · Oct 13, 2026 | #49 · Was SOTA · General LLM Margin 33.33333333333333 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #3 · Near-SOTA · Reasoning Margin 2.7397260273972535 LMArena leaderboard dataset · Oct 13, 2026 | #40 · Was SOTA · Reasoning Margin 28.082191780821915 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in Math Margin 53.333333333333336 Epoch AI benchmarking hub · Sep 29, 2025 |
| Science | #56 · #56 in Science Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #82 · #82 in Science Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
| Coding | #6 · #6 in Coding Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #6 · #6 in Coding › Agentic Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #17 · Was SOTA · Coding › Web dev Margin 14.953271028037378 LMArena leaderboard dataset · Oct 13, 2026 | #78 · Was SOTA · Coding › Web dev Margin 71.96261682242991 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #3 · Near-SOTA · Long context Margin 2.040816326530603 LMArena leaderboard dataset · Oct 13, 2026 | #29 · Was SOTA · Long context Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #5 · Was SOTA · Vision Margin 15.78947368421052 Epoch AI benchmarking hub · Jun 9, 2026 | — |
| Factuality | #7 · Was SOTA · Factuality Margin 5.97014925373135 LMArena leaderboard dataset · Oct 13, 2026 | #50 · #50 in Factuality Margin 38.059701492537314 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #66 · #66 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 29, 2025 |
Claude Fable 5: $20 per 1M blended tokens.
Claude Sonnet 4.5: $6 per 1M blended tokens.
Claude Fable 5: closed weights.
Claude Sonnet 4.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in General LLM at #3 against #49.
Reasoning: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Reasoning at #3 against #40.
Science: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Science at #56 against #82.
Coding › Web dev: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Coding › Web dev at #17 against #78.
Long context: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Long context at #3 against #29.
Factuality: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Factuality at #7 against #50.
Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Abstraction (ARC) at #1 against #66.
Claude Fable 5 · Claude Sonnet 4.5
Claude Fable 5 or Claude Sonnet 4.5?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).
Claude Fable 5 or Claude Sonnet 4.5 for General LLM?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in General LLM at #3 against #49.
Claude Fable 5 or Claude Sonnet 4.5 for Reasoning?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Reasoning at #3 against #40.
Claude Fable 5 or Claude Sonnet 4.5 for Science?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 4.5 in Science at #56 against #82.