Claude Sonnet 5.5 vs Gemini 3.5 Flash
As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in 5 of 7 shared categories: Reasoning, Science, Coding › Web dev, Long context, and Vision.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
Gemini 3.5 Flash
#12 Best recorded rank: #12 in Abstraction (ARC), as of Oct 15, 2026.
| Category | Claude Sonnet 5.5 | Gemini 3.5 Flash |
|---|---|---|
| General LLM | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 | #25 · #25 in General LLM Margin 13.297872340425528 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 | #35 · #35 in Reasoning Margin 19.148936170212764 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 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 — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #3 · Near-SOTA · Coding › Web dev Margin 1.5999999999999943 LMArena leaderboard dataset · Oct 13, 2026 | #52 · #52 in Coding › Web dev Margin 40.8 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Long context Margin 17.55319148936171 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · May 19, 2026 |
| Factuality | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 | #14 · #14 in Factuality Margin 8.720930232558146 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 19, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Gemini 3.5 Flash: $3.375 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
Gemini 3.5 Flash: closed weights.
General LLM: As of Oct 15, 2026, Gemini 3.5 Flash leads Claude Sonnet 5.5 in General LLM at #25 against #29.
Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Reasoning at #18 against #35.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Science at #3 against #18.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Coding › Web dev at #3 against #52.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Long context at #11 against #33.
Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Vision at #1 against #29.
Factuality: As of Oct 15, 2026, Gemini 3.5 Flash leads Claude Sonnet 5.5 in Factuality at #14 against #17.
Claude Sonnet 5.5 · Gemini 3.5 Flash
Claude Sonnet 5.5 or Gemini 3.5 Flash?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in 5 of 7 shared categories: Reasoning, Science, Coding › Web dev, Long context, and Vision.
Claude Sonnet 5.5 or Gemini 3.5 Flash for General LLM?
As of Oct 15, 2026, Gemini 3.5 Flash leads Claude Sonnet 5.5 in General LLM at #25 against #29.
Claude Sonnet 5.5 or Gemini 3.5 Flash for Reasoning?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Reasoning at #18 against #35.
Claude Sonnet 5.5 or Gemini 3.5 Flash for Science?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.5 Flash in Science at #3 against #18.