Claude Opus 5 vs Gemini 3.8 Flash
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in 5 of 10 shared categories: Coding, Coding › Agentic, Coding › Web dev, Vision, and Factuality.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Gemini 3.8 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Opus 5 | Gemini 3.8 Flash |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #7 · Near-SOTA · General LLM Margin 3.723404255319153 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #6 · Near-SOTA · Reasoning Margin 3.723404255319153 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 | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #4 · #4 in Science Margin — Epoch AI benchmarking hub · Sep 2, 2026 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #15 · #15 in Coding Margin 72.72727272727272 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 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 | #6 · Near-SOTA · Coding › Web dev Margin 4 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in Coding › Web dev Margin 22.400000000000006 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Near-SOTA · Long context Margin 2.659574468085111 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #15 · #15 in Vision Margin 42.10526315789474 Epoch AI benchmarking hub · Sep 2, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 | #19 · #19 in Factuality Margin 11.6279069767442 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 2, 2026 |
Claude Opus 5: $10 per 1M blended tokens.
Gemini 3.8 Flash: $1.5 per 1M blended tokens.
Claude Opus 5: closed weights.
Gemini 3.8 Flash: closed weights.
General LLM: As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in General LLM at #7 against #11.
Reasoning: As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in Reasoning at #6 against #9.
Science: As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in Science at #4 against #12.
Coding: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in Coding at #4 against #15.
Coding › Agentic: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in Coding › Agentic at #4 against #15.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in Coding › Web dev at #6 against #29.
Long context: As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in Long context at #5 against #9.
Vision: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in Vision at #12 against #15.
Factuality: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in Factuality at #4 against #19.
Abstraction (ARC): As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in Abstraction (ARC) at #1 against #3.
Claude Opus 5 · Gemini 3.8 Flash
Claude Opus 5 or Gemini 3.8 Flash?
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.8 Flash in 5 of 10 shared categories: Coding, Coding › Agentic, Coding › Web dev, Vision, and Factuality.
Claude Opus 5 or Gemini 3.8 Flash for General LLM?
As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in General LLM at #7 against #11.
Claude Opus 5 or Gemini 3.8 Flash for Reasoning?
As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in Reasoning at #6 against #9.
Claude Opus 5 or Gemini 3.8 Flash for Science?
As of Oct 15, 2026, Gemini 3.8 Flash leads Claude Opus 5 in Science at #4 against #12.