Claude Sonnet 5.5 vs Kimi K2 6
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in 7 of 7 shared categories: General LLM, Reasoning, 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.
Kimi K2 6
It used to be. Was SOTA in Coding › Web dev.
| Category | Claude Sonnet 5.5 | Kimi K2 6 |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #40 · #40 in General LLM Margin 27.21088435374149 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #38 · #38 in Reasoning Margin 26.71232876712328 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 | #29 · #29 in Science Margin — Epoch AI benchmarking hub · Apr 20, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Apr 20, 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 | #45 · #45 in Coding › Web dev Margin 41.12149532710281 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #37 · #37 in Long context Margin 25.17006802721089 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #30 · #30 in Vision Margin 89.47368421052632 Epoch AI benchmarking hub · Apr 20, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #40 · #40 in Factuality Margin 30.59701492537313 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Kimi K2 6: $1.3399999999999999 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
Kimi K2 6: open weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in General LLM at #27 against #40.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Reasoning at #18 against #38.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Science at #3 against #29.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Coding › Web dev at #3 against #45.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Long context at #11 against #37.
Vision: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Vision at #1 against #30.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Factuality at #16 against #40.
Claude Sonnet 5.5 or Kimi K2 6?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in 7 of 7 shared categories: General LLM, Reasoning, Science, Coding › Web dev, Long context, Vision, and Factuality.
Claude Sonnet 5.5 or Kimi K2 6 for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in General LLM at #27 against #40.
Claude Sonnet 5.5 or Kimi K2 6 for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Reasoning at #18 against #38.
Claude Sonnet 5.5 or Kimi K2 6 for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 6 in Science at #3 against #29.