Claude Sonnet 5.5 vs Kimi K2 5 Thinking
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, 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 5 Thinking
It used to be. Was SOTA in Coding › Web dev.
| Category | Claude Sonnet 5.5 | Kimi K2 5 Thinking |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #56 · #56 in General LLM Margin 38.095238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #58 · #58 in Reasoning Margin 40.41095890410959 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 | — |
| 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 | #61 · #61 in Coding › Web dev Margin 56.074766355140184 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #57 · #57 in Long context Margin 38.775510204081634 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #58 · #58 in Factuality Margin 44.02985074626866 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Kimi K2 5 Thinking: price per 1M tokens is unset in the catalog.
Claude Sonnet 5.5: closed weights.
Kimi K2 5 Thinking: open weights.
General LLM: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in General LLM at #27 against #56.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in Reasoning at #18 against #58.
Coding › Web dev: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in Coding › Web dev at #3 against #61.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in Long context at #11 against #57.
Factuality: As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in Factuality at #16 against #58.
Claude Sonnet 5.5 · Kimi K2 5 Thinking
Claude Sonnet 5.5 or Kimi K2 5 Thinking?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Sonnet 5.5 or Kimi K2 5 Thinking for General LLM?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in General LLM at #27 against #56.
Claude Sonnet 5.5 or Kimi K2 5 Thinking for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in Reasoning at #18 against #58.
Claude Sonnet 5.5 or Kimi K2 5 Thinking for Coding › Web dev?
As of Oct 14, 2026, Claude Sonnet 5.5 leads Kimi K2 5 Thinking in Coding › Web dev at #3 against #61.