Claude Fable 5.1 vs Claude Opus 5
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in 8 of 9 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Fable 5.1
Yes. SOTA in Factuality (tied).
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
| Category | Claude Fable 5.1 | Claude Opus 5 |
|---|---|---|
| General LLM | #6 · Near-SOTA · General LLM Margin 3.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Near-SOTA · Reasoning Margin 3.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 | #9 · Was SOTA · Reasoning Margin 5.319148936170208 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 | — | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #3 · Near-SOTA · Coding › Agentic Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #4 · #4 in Coding › Agentic Margin 22.727272727272734 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 | #6 · Near-SOTA · Coding › Web dev Margin 4 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Near-SOTA · Long context Margin 3.1914893617021107 LMArena leaderboard dataset · Oct 13, 2026 | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 |
Claude Fable 5.1: $20 per 1M blended tokens.
Claude Opus 5: $10 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Claude Opus 5: closed weights.
General LLM: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in General LLM at #6 against #11.
Reasoning: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Reasoning at #5 against #9.
Coding: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Coding at #3 against #4.
Coding › Agentic: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Coding › Agentic at #3 against #4.
Coding › Web dev: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Coding › Web dev at #5 against #6.
Long context: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Long context at #6 against #9.
Vision: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Vision at #6 against #12.
Factuality: As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Factuality at #1 against #4.
Abstraction (ARC): As of Oct 15, 2026, Claude Fable 5.1 and Claude Opus 5 share #3 in Abstraction (ARC).
Claude Fable 5.1 · Claude Opus 5
Claude Fable 5.1 or Claude Opus 5?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in 8 of 9 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Fable 5.1 or Claude Opus 5 for General LLM?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in General LLM at #6 against #11.
Claude Fable 5.1 or Claude Opus 5 for Reasoning?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Reasoning at #5 against #9.
Claude Fable 5.1 or Claude Opus 5 for Coding?
As of Oct 15, 2026, Claude Fable 5.1 leads Claude Opus 5 in Coding at #3 against #4.