Claude Opus 5.5 vs Gemini 3.5 Flash
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in 7 of 8 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
Gemini 3.5 Flash
#12 Best recorded rank: #12 in Abstraction (ARC), as of Oct 14, 2026.
| Category | Claude Opus 5.5 | Gemini 3.5 Flash |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #24 · #24 in General LLM Margin 16.326530612244895 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #32 · #32 in Reasoning Margin 22.602739726027394 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #18 · #18 in Science Margin — Epoch AI benchmarking hub · May 19, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · May 19, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #48 · #48 in Coding › Web dev Margin 43.925233644859816 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #28 · #28 in Long context Margin 19.04761904761905 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · May 19, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #13 · #13 in Factuality Margin 10.447761194029852 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 19, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Gemini 3.5 Flash: $3.375 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Gemini 3.5 Flash: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in General LLM at #2 against #24.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Reasoning at #1 against #32.
Science: As of Oct 14, 2026, Gemini 3.5 Flash leads Claude Opus 5.5 in Science at #18 against #31.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Coding › Web dev at #1 against #48.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Long context at #1 against #28.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Vision at #4 against #29.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Factuality at #1 against #13.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Abstraction (ARC) at #1 against #12.
Claude Opus 5.5 · Gemini 3.5 Flash
Claude Opus 5.5 or Gemini 3.5 Flash?
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in 7 of 8 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or Gemini 3.5 Flash for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in General LLM at #2 against #24.
Claude Opus 5.5 or Gemini 3.5 Flash for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.5 Flash in Reasoning at #1 against #32.
Claude Opus 5.5 or Gemini 3.5 Flash for Science?
As of Oct 14, 2026, Gemini 3.5 Flash leads Claude Opus 5.5 in Science at #18 against #31.