Claude Opus 5 vs Gemini 3.5 Flash
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in 8 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Gemini 3.5 Flash
#12 Best recorded rank: #12 in Abstraction (ARC), as of Oct 15, 2026.
| Category | Claude Opus 5 | Gemini 3.5 Flash |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in General LLM Margin 13.297872340425528 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Reasoning Margin 19.148936170212764 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 | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #18 · #18 in Science Margin — Epoch AI benchmarking hub · May 19, 2026 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #6 · Near-SOTA · Coding › Web dev Margin 4 LMArena leaderboard dataset · Oct 13, 2026 | #52 · #52 in Coding › Web dev Margin 40.8 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Long context Margin 17.55319148936171 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · May 19, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 | #14 · #14 in Factuality Margin 8.720930232558146 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 19, 2026 |
Claude Opus 5: $10 per 1M blended tokens.
Gemini 3.5 Flash: $3.375 per 1M blended tokens.
Claude Opus 5: closed weights.
Gemini 3.5 Flash: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in General LLM at #11 against #25.
Reasoning: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Reasoning at #9 against #35.
Science: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Science at #12 against #18.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Coding › Web dev at #6 against #52.
Long context: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Long context at #9 against #33.
Vision: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Vision at #12 against #29.
Factuality: As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Factuality at #4 against #14.
Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Abstraction (ARC) at #3 against #12.
Claude Opus 5 · Gemini 3.5 Flash
Claude Opus 5 or Gemini 3.5 Flash?
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in 8 of 8 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5 or Gemini 3.5 Flash for General LLM?
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in General LLM at #11 against #25.
Claude Opus 5 or Gemini 3.5 Flash for Reasoning?
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Reasoning at #9 against #35.
Claude Opus 5 or Gemini 3.5 Flash for Science?
As of Oct 15, 2026, Claude Opus 5 leads Gemini 3.5 Flash in Science at #12 against #18.