Claude Fable 5 vs O3
As of Oct 14, 2026, Claude Fable 5 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
| Category | Claude Fable 5 | O3 |
|---|---|---|
| General LLM | #3 · Near-SOTA · General LLM Margin 2.040816326530617 LMArena leaderboard dataset · Oct 13, 2026 | #78 · Was SOTA · General LLM Margin 53.06122448979592 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #3 · Near-SOTA · Reasoning Margin 2.7397260273972535 LMArena leaderboard dataset · Oct 13, 2026 | #90 · Was SOTA · Reasoning Margin 62.32876712328767 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #20 · Was SOTA · Math Margin 42.22222222222222 Epoch AI benchmarking hub · Apr 16, 2025 |
| Science | #56 · #56 in Science Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #67 · #67 in Science Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding | #6 · #6 in Coding Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Apr 16, 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 | — |
| Long context | #3 · Near-SOTA · Long context Margin 2.040816326530603 LMArena leaderboard dataset · Oct 13, 2026 | #110 · Was SOTA · Long context Margin 74.82993197278913 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #5 · Was SOTA · Vision Margin 15.78947368421052 Epoch AI benchmarking hub · Jun 9, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #7 · Was SOTA · Factuality Margin 5.97014925373135 LMArena leaderboard dataset · Oct 13, 2026 | #105 · #105 in Factuality Margin 79.1044776119403 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jun 9, 2026 | #37 · #37 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
Claude Fable 5: $20 per 1M blended tokens.
O3: $3.5 per 1M blended tokens.
Claude Fable 5: closed weights.
O3: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5 leads O3 in General LLM at #3 against #78.
Reasoning: As of Oct 14, 2026, Claude Fable 5 leads O3 in Reasoning at #3 against #90.
Science: As of Oct 14, 2026, Claude Fable 5 leads O3 in Science at #56 against #67.
Long context: As of Oct 14, 2026, Claude Fable 5 leads O3 in Long context at #3 against #110.
Factuality: As of Oct 14, 2026, Claude Fable 5 leads O3 in Factuality at #7 against #105.
Abstraction (ARC): As of Oct 14, 2026, Claude Fable 5 leads O3 in Abstraction (ARC) at #1 against #37.
Claude Fable 5 or O3?
As of Oct 14, 2026, Claude Fable 5 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
Claude Fable 5 or O3 for General LLM?
As of Oct 14, 2026, Claude Fable 5 leads O3 in General LLM at #3 against #78.
Claude Fable 5 or O3 for Reasoning?
As of Oct 14, 2026, Claude Fable 5 leads O3 in Reasoning at #3 against #90.
Claude Fable 5 or O3 for Science?
As of Oct 14, 2026, Claude Fable 5 leads O3 in Science at #56 against #67.