Claude Fable 5 vs Claude Sonnet 5.5
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in 4 of 9 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Fable 5
Close. Near-SOTA in General LLM, rank #3.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
| Category | Claude Fable 5 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #3 · Near-SOTA · General LLM Margin 1.5957446808510696 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #3 · Near-SOTA · Reasoning Margin 2.1276595744680833 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #56 · #56 in Science Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 |
| Coding | #6 · #6 in Coding Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #6 · #6 in Coding › Agentic Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #19 · Was SOTA · Coding › Web dev Margin 14.400000000000006 LMArena leaderboard dataset · Oct 13, 2026 | #3 · Near-SOTA · Coding › Web dev Margin 1.5999999999999943 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #3 · Near-SOTA · Long context Margin 1.5957446808510696 LMArena leaderboard dataset · Oct 13, 2026 | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #5 · Was SOTA · Vision Margin 15.78947368421052 Epoch AI benchmarking hub · Jun 9, 2026 | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 |
| Factuality | #7 · Was SOTA · Factuality Margin 4.6511627906976685 LMArena leaderboard dataset · Oct 13, 2026 | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jun 9, 2026 | — |
Claude Fable 5: $20 per 1M blended tokens.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Fable 5: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in General LLM at #3 against #29.
Reasoning: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in Reasoning at #3 against #18.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Fable 5 in Science at #3 against #56.
Coding: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Fable 5 in Coding at #1 against #6.
Coding › Agentic: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Fable 5 in Coding › Agentic at #1 against #6.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Fable 5 in Coding › Web dev at #3 against #19.
Long context: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in Long context at #3 against #11.
Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Fable 5 in Vision at #1 against #5.
Factuality: As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in Factuality at #7 against #17.
Claude Fable 5 · Claude Sonnet 5.5
Claude Fable 5 or Claude Sonnet 5.5?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in 4 of 9 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Fable 5 or Claude Sonnet 5.5 for General LLM?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in General LLM at #3 against #29.
Claude Fable 5 or Claude Sonnet 5.5 for Reasoning?
As of Oct 15, 2026, Claude Fable 5 leads Claude Sonnet 5.5 in Reasoning at #3 against #18.
Claude Fable 5 or Claude Sonnet 5.5 for Science?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Fable 5 in Science at #3 against #56.