Claude Fable 5.1 vs Gemini 3.8 Flash
As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in 8 of 10 shared categories: General LLM, Reasoning, Math, Coding, Coding › Agentic, Coding › Web dev, Vision, and Factuality.
Claude Fable 5.1
Yes. SOTA in co-SOTA in Factuality.
Gemini 3.8 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Fable 5.1 | Gemini 3.8 Flash |
|---|---|---|
| General LLM | #6 · Was SOTA · General LLM Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #7 · Was SOTA · General LLM Margin 4.761904761904759 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #5 · Was SOTA · Reasoning Margin 4.109589041095887 LMArena leaderboard dataset · Oct 13, 2026 | #6 · #6 in Reasoning Margin 4.794520547945211 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #2 · Near-SOTA · Math Margin 2.2222222222222285 Epoch AI benchmarking hub · Sep 1, 2026 | #5 · #5 in Math Margin 8.888888888888886 Epoch AI benchmarking hub · Sep 2, 2026 |
| Science | — | #4 · #4 in Science Margin — Epoch AI benchmarking hub · Sep 2, 2026 |
| Coding | #3 · Near-SOTA · Coding Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #15 · #15 in Coding Margin 72.72727272727272 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #3 · Near-SOTA · Coding › Agentic Margin 18.181818181818187 Terminal-Bench Harbor Hub · Oct 6, 2026 | #15 · #15 in Coding › Agentic Margin 72.72727272727272 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 | #27 · #27 in Coding › Web dev Margin 24.29906542056075 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #6 · Was SOTA · Long context Margin 4.08163265306122 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Near-SOTA · Long context Margin 3.401360544217681 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #6 · #6 in Vision Margin 18.421052631578945 Epoch AI benchmarking hub · Sep 1, 2026 | #15 · #15 in Vision Margin 42.10526315789474 Epoch AI benchmarking hub · Sep 2, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #17 · #17 in Factuality Margin 13.43283582089552 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 1, 2026 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 2, 2026 |
Claude Fable 5.1: $20 per 1M blended tokens.
Gemini 3.8 Flash: $1.5 per 1M blended tokens.
Claude Fable 5.1: closed weights.
Gemini 3.8 Flash: closed weights.
General LLM: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in General LLM at #6 against #7.
Reasoning: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Reasoning at #5 against #6.
Math: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Math at #2 against #5.
Coding: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Coding at #3 against #15.
Coding › Agentic: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Coding › Agentic at #3 against #15.
Coding › Web dev: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Coding › Web dev at #5 against #27.
Long context: As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Fable 5.1 in Long context at #5 against #6.
Vision: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Vision at #6 against #15.
Factuality: As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Factuality at #1 against #17.
Abstraction (ARC): As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Fable 5.1 in Abstraction (ARC) at #1 against #3.
Claude Fable 5.1 · Gemini 3.8 Flash
Claude Fable 5.1 or Gemini 3.8 Flash?
As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in 8 of 10 shared categories: General LLM, Reasoning, Math, Coding, Coding › Agentic, Coding › Web dev, Vision, and Factuality.
Claude Fable 5.1 or Gemini 3.8 Flash for General LLM?
As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in General LLM at #6 against #7.
Claude Fable 5.1 or Gemini 3.8 Flash for Reasoning?
As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Reasoning at #5 against #6.
Claude Fable 5.1 or Gemini 3.8 Flash for Math?
As of Oct 14, 2026, Claude Fable 5.1 leads Gemini 3.8 Flash in Math at #2 against #5.