Claude Fable 5 vs Claude Opus 4.5
As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 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 Opus 4.5
It used to be. Was SOTA in Reasoning.
| Category | Claude Fable 5 | Claude Opus 4.5 |
|---|---|---|
| General LLM | #3 · Near-SOTA · General LLM Margin 2.040816326530617 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in General LLM Margin 22.448979591836732 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #3 · Near-SOTA · Reasoning Margin 2.7397260273972535 LMArena leaderboard dataset · Oct 13, 2026 | #28 · Was SOTA · Reasoning Margin 19.86301369863014 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #16 · #16 in Math Margin 33.33333333333333 Epoch AI benchmarking hub · Nov 24, 2025 |
| Science | #56 · #56 in Science Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #68 · #68 in Science Margin — Epoch AI benchmarking hub · Nov 24, 2025 |
| Coding | #6 · #6 in Coding Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 24, 2025 |
| 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 | #53 · Was SOTA · Coding › Web dev Margin 48.598130841121495 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #3 · Near-SOTA · Long context Margin 2.040816326530603 LMArena leaderboard dataset · Oct 13, 2026 | #19 · Was SOTA · Long context Margin 12.925170068027214 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 | #36 · #36 in Factuality Margin 27.611940298507463 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #49 · #49 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 24, 2025 |
Claude Fable 5: $20 per 1M blended tokens.
Claude Opus 4.5: $10 per 1M blended tokens.
Claude Fable 5: closed weights.
Claude Opus 4.5: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in General LLM at #3 against #33.
Reasoning: As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Reasoning at #3 against #28.
Science: As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Science at #56 against #68.
Coding › Web dev: As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Coding › Web dev at #17 against #53.
Long context: As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Long context at #3 against #19.
Factuality: As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Factuality at #7 against #36.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Abstraction (ARC) at #1 against #49.
Claude Fable 5 · Claude Opus 4.5
Claude Fable 5 or Claude Opus 4.5?
As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 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 Opus 4.5 for General LLM?
As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in General LLM at #3 against #33.
Claude Fable 5 or Claude Opus 4.5 for Reasoning?
As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Reasoning at #3 against #28.
Claude Fable 5 or Claude Opus 4.5 for Science?
As of Oct 14, 2026, Claude Fable 5 leads Claude Opus 4.5 in Science at #56 against #68.