Claude Sonnet 5.5 vs Kimi K3
As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in 4 of 7 shared categories: Science, Coding › Web dev, Vision, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
Kimi K3
Yes. Yes on General LLM (open weights); Reasoning (open weights). Not the overall leader.
| Category | Claude Sonnet 5.5 | Kimi K3 |
|---|---|---|
| General LLM | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 | #13 · #13 in General LLM Margin 6.914893617021278 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in Reasoning Margin 4.255319148936167 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 | #17 · #17 in Science Margin — Epoch AI benchmarking hub · Jul 16, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Scale Labs leaderboards · Oct 14, 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 | #12 · Was SOTA · Coding › Web dev Margin 8.799999999999997 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #8 · Was SOTA · Long context Margin 4.255319148936167 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #22 · #22 in Vision Margin 60.526315789473685 Epoch AI benchmarking hub · Jul 16, 2026 |
| Factuality | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 | #22 · #22 in Factuality Margin 13.372093023255815 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | — | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 16, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Kimi K3: $4.109999999999999 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
Kimi K3: open weights.
General LLM: As of Oct 15, 2026, Kimi K3 leads Claude Sonnet 5.5 in General LLM at #13 against #29.
Reasoning: As of Oct 15, 2026, Kimi K3 leads Claude Sonnet 5.5 in Reasoning at #7 against #18.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in Science at #3 against #17.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in Coding › Web dev at #3 against #12.
Long context: As of Oct 15, 2026, Kimi K3 leads Claude Sonnet 5.5 in Long context at #8 against #11.
Vision: As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in Vision at #1 against #22.
Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in Factuality at #17 against #22.
Claude Sonnet 5.5 or Kimi K3?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in 4 of 7 shared categories: Science, Coding › Web dev, Vision, and Factuality.
Claude Sonnet 5.5 or Kimi K3 for General LLM?
As of Oct 15, 2026, Kimi K3 leads Claude Sonnet 5.5 in General LLM at #13 against #29.
Claude Sonnet 5.5 or Kimi K3 for Reasoning?
As of Oct 15, 2026, Kimi K3 leads Claude Sonnet 5.5 in Reasoning at #7 against #18.
Claude Sonnet 5.5 or Kimi K3 for Science?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Kimi K3 in Science at #3 against #17.