Claude Fable 5.1 vs O3
As of Oct 14, 2026, Claude Fable 5.1 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Math, Long context, Factuality, and Abstraction (ARC).
| Category | Claude Fable 5.1 | O3 |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #78 · Was SOTA · General LLM Margin 53.06122448979592 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #90 · Was SOTA · Reasoning Margin 62.32876712328767 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #20 · Was SOTA · Math Margin 42.22222222222222 Epoch AI benchmarking hub · Apr 16, 2025 |
| Science | — | #67 · #67 in Science Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding › Agentic | #3 · Near-SOTA · Coding › Agentic Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #5 · Near-SOTA · Coding › Web dev Margin 3.738317757009341 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #6 · Was SOTA · Long context Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #110 · Was SOTA · Long context Margin 74.82993197278913 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #105 · #105 in Factuality Margin 79.1044776119403 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #37 · #37 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
Claude Fable 5.1: $20 per 1M blended tokens.
O3: $3.5 per 1M blended tokens.
Claude Fable 5.1: closed weights.
O3: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads O3 in General LLM at #6 against #78.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Reasoning at #5 against #90.
Math: As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Math at #2 against #20.
Long context: As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Long context at #6 against #110.
Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Factuality at #1 against #105.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Abstraction (ARC) at #3 against #37.
Claude Fable 5.1 or O3?
As of Oct 14, 2026, Claude Fable 5.1 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Math, Long context, Factuality, and Abstraction (ARC).
Claude Fable 5.1 or O3 for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads O3 in General LLM at #6 against #78.
Claude Fable 5.1 or O3 for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Reasoning at #5 against #90.
Claude Fable 5.1 or O3 for Math?
As of Oct 14, 2026, Claude Fable 5.1 leads O3 in Math at #2 against #20.