Claude Opus 5.5 vs Gemini 3.8 Flash
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in 8 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
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 3.8 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Opus 5.5 | Gemini 3.8 Flash |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #7 · Was SOTA · General LLM Margin 4.761904761904759 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #6 · #6 in Reasoning Margin 4.794520547945211 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #5 · #5 in Math Margin 8.888888888888886 Epoch AI benchmarking hub · Sep 2, 2026 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #4 · #4 in Science Margin — Epoch AI benchmarking hub · Sep 2, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #15 · #15 in Coding Margin 72.72727272727272 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 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 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Coding › Web dev Margin 24.29906542056075 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Near-SOTA · Long context Margin 3.401360544217681 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 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) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 2, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Gemini 3.8 Flash: $1.5 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Gemini 3.8 Flash: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in General LLM at #2 against #7.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Reasoning at #1 against #6.
Science: As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Opus 5.5 in Science at #4 against #31.
Coding: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Coding at #1 against #15.
Coding › Agentic: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Coding › Agentic at #1 against #15.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Coding › Web dev at #1 against #27.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Long context at #1 against #5.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Vision at #4 against #15.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Factuality at #1 against #17.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 and Gemini 3.8 Flash share #1 in Abstraction (ARC).
Claude Opus 5.5 · Gemini 3.8 Flash
Claude Opus 5.5 or Gemini 3.8 Flash?
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in 8 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Vision, and Factuality.
Claude Opus 5.5 or Gemini 3.8 Flash for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in General LLM at #2 against #7.
Claude Opus 5.5 or Gemini 3.8 Flash for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Gemini 3.8 Flash in Reasoning at #1 against #6.
Claude Opus 5.5 or Gemini 3.8 Flash for Science?
As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Opus 5.5 in Science at #4 against #31.