Claude Opus 5.5 vs Kimi K2 6
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in 6 of 7 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, and Factuality.
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
Kimi K2 6
It used to be. Was SOTA in Coding › Web dev.
| Category | Claude Opus 5.5 | Kimi K2 6 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #40 · #40 in General LLM Margin 27.21088435374149 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #38 · #38 in Reasoning Margin 26.71232876712328 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 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 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #45 · #45 in Coding › Web dev Margin 41.12149532710281 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #37 · #37 in Long context Margin 25.17006802721089 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #30 · #30 in Vision Margin 89.47368421052632 Epoch AI benchmarking hub · Apr 20, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #40 · #40 in Factuality Margin 30.59701492537313 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Kimi K2 6: $1.3399999999999999 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Kimi K2 6: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in General LLM at #2 against #40.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in Reasoning at #1 against #38.
Science: As of Oct 14, 2026, Kimi K2 6 leads Claude Opus 5.5 in Science at #29 against #31.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in Coding › Web dev at #1 against #45.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in Long context at #1 against #37.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in Vision at #4 against #30.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in Factuality at #1 against #40.
Claude Opus 5.5 or Kimi K2 6?
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in 6 of 7 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, and Factuality.
Claude Opus 5.5 or Kimi K2 6 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in General LLM at #2 against #40.
Claude Opus 5.5 or Kimi K2 6 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K2 6 in Reasoning at #1 against #38.
Claude Opus 5.5 or Kimi K2 6 for Science?
As of Oct 14, 2026, Kimi K2 6 leads Claude Opus 5.5 in Science at #29 against #31.