Claude Sonnet 5.5 vs Gemini 3.8 Flash
As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in 7 of 10 shared categories: Math, Science, Coding, Coding › Agentic, Coding › Web dev, 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 3.8 Flash
Yes. Yes on General LLM (best per dollar); Reasoning (best per dollar). Not the overall leader.
| Category | Claude Sonnet 5.5 | Gemini 3.8 Flash |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #7 · Was SOTA · General LLM Margin 4.761904761904759 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #6 · #6 in Reasoning Margin 4.794520547945211 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #5 · #5 in Math Margin 8.888888888888886 Epoch AI benchmarking hub · Sep 2, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 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 | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in Coding › Web dev Margin 24.29906542056075 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #5 · Near-SOTA · Long context Margin 3.401360544217681 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #15 · #15 in Vision Margin 42.10526315789474 Epoch AI benchmarking hub · Sep 2, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 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 2, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Gemini 3.8 Flash: $1.5 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
Gemini 3.8 Flash: closed weights.
General LLM: As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Sonnet 5.5 in General LLM at #7 against #27.
Reasoning: As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Sonnet 5.5 in Reasoning at #6 against #18.
Math: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Math at #4 against #5.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Science at #3 against #4.
Coding: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Coding at #1 against #15.
Coding › Agentic: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Coding › Agentic at #1 against #15.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Coding › Web dev at #3 against #27.
Long context: As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Sonnet 5.5 in Long context at #5 against #11.
Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Vision at #1 against #15.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Factuality at #16 against #17.
Claude Sonnet 5.5 · Gemini 3.8 Flash
Claude Sonnet 5.5 or Gemini 3.8 Flash?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in 7 of 10 shared categories: Math, Science, Coding, Coding › Agentic, Coding › Web dev, Vision, and Factuality.
Claude Sonnet 5.5 or Gemini 3.8 Flash for General LLM?
As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Sonnet 5.5 in General LLM at #7 against #27.
Claude Sonnet 5.5 or Gemini 3.8 Flash for Reasoning?
As of Oct 14, 2026, Gemini 3.8 Flash leads Claude Sonnet 5.5 in Reasoning at #6 against #18.
Claude Sonnet 5.5 or Gemini 3.8 Flash for Math?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Gemini 3.8 Flash in Math at #4 against #5.