Claude Sonnet 5.5 vs Gemini 3.1 Pro Preview
As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in 5 of 8 shared categories: Science, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
Gemini 3.1 Pro Preview
Yes. Yes on Math (best per dollar). Not the overall leader.
| Category | Claude Sonnet 5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #15 · Was SOTA · General LLM Margin 10.204081632653057 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #14 · Was SOTA · Reasoning Margin 10.273972602739732 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #3 · Near-SOTA · Math Margin 4.444444444444443 Epoch AI benchmarking hub · Feb 19, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 | #7 · #7 in Science Margin — Epoch AI benchmarking hub · Feb 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 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | #58 · #58 in Coding › Web dev Margin 53.271028037383175 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #12 · Was SOTA · Long context Margin 8.163265306122454 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #25 · Was SOTA · Vision Margin 68.42105263157896 Epoch AI benchmarking hub · Feb 19, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Factuality Margin 14.179104477611943 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #2 · #2 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Feb 19, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Gemini 3.1 Pro Preview: $4.5 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
Gemini 3.1 Pro Preview: closed weights.
General LLM: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in General LLM at #15 against #27.
Reasoning: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in Reasoning at #14 against #18.
Math: As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in Math at #3 against #4.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Science at #3 against #7.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Coding › Web dev at #3 against #58.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Long context at #11 against #12.
Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Vision at #1 against #25.
Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in Factuality at #16 against #18.
Claude Sonnet 5.5 · Gemini 3.1 Pro Preview
Claude Sonnet 5.5 or Gemini 3.1 Pro Preview?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Gemini 3.1 Pro Preview in 5 of 8 shared categories: Science, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5 or Gemini 3.1 Pro Preview for General LLM?
As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in General LLM at #15 against #27.
Claude Sonnet 5.5 or Gemini 3.1 Pro Preview for Reasoning?
As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in Reasoning at #14 against #18.
Claude Sonnet 5.5 or Gemini 3.1 Pro Preview for Math?
As of Oct 15, 2026, Gemini 3.1 Pro Preview leads Claude Sonnet 5.5 in Math at #3 against #4.