Claude Fable 5.1 vs Claude Opus 4.8
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in 9 of 9 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Fable 5.1
Yes. SOTA in Factuality (tied).
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
| Category | Claude Fable 5.1 | Claude Opus 4.8 |
|---|---|---|
| General LLM | #6 · Near-SOTA · General LLM Margin 3.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 | #21 · #21 in General LLM Margin 11.170212765957444 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Near-SOTA · Reasoning Margin 3.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 | #10 · #10 in Reasoning Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | — | #27 · #27 in Science Margin — Epoch AI benchmarking hub · May 28, 2026 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #12 · #12 in Coding Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #3 · Near-SOTA · Coding › Agentic Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #12 · #12 in Coding › Agentic Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #5 · Near-SOTA · Coding › Web dev Margin 3.200000000000003 LMArena leaderboard dataset · Oct 13, 2026 | #35 · Was SOTA · Coding › Web dev Margin 27.200000000000003 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Near-SOTA · Long context Margin 3.1914893617021107 LMArena leaderboard dataset · Oct 13, 2026 | #10 · Was SOTA · Long context Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #24 · #24 in Factuality Margin 14.534883720930239 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 |
Claude Fable 5.1: $20 per 1M blended tokens.
Claude Opus 4.8: $10 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Claude Opus 4.8: closed weights.
General LLM: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in General LLM at #6 against #21.
Reasoning: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Reasoning at #5 against #10.
Coding: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Coding at #3 against #12.
Coding › Agentic: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Coding › Agentic at #3 against #12.
Coding › Web dev: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Coding › Web dev at #5 against #35.
Long context: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Long context at #6 against #10.
Vision: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Vision at #6 against #13.
Factuality: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Factuality at #1 against #24.
Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Abstraction (ARC) at #3 against #12.
Claude Fable 5.1 · Claude Opus 4.8
Claude Fable 5.1 or Claude Opus 4.8?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in 9 of 9 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Fable 5.1 or Claude Opus 4.8 for General LLM?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in General LLM at #6 against #21.
Claude Fable 5.1 or Claude Opus 4.8 for Reasoning?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Reasoning at #5 against #10.
Claude Fable 5.1 or Claude Opus 4.8 for Coding?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 4.8 in Coding at #3 against #12.