Claude Opus 5.5 vs Kimi K2 0905 Preview
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 5.5
Yes. SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
Kimi K2 0905 Preview
#120 Best current rank: #120 in General LLM, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | Kimi K2 0905 Preview |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #120 · #120 in General LLM Margin 63.829787234042556 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #122 · #122 in Reasoning Margin 65.42553191489361 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 | — |
| 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 | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #151 · #151 in Long context Margin 80.31914893617021 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #140 · #140 in Factuality Margin 81.97674418604652 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 0905 Preview: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
Kimi K2 0905 Preview: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in General LLM at #2 against #120.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Reasoning at #1 against #122.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Long context at #1 against #151.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Factuality at #1 against #140.
Claude Opus 5.5 · Kimi K2 0905 Preview
Claude Opus 5.5 or Kimi K2 0905 Preview?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 5.5 or Kimi K2 0905 Preview for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in General LLM at #2 against #120.
Claude Opus 5.5 or Kimi K2 0905 Preview for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Reasoning at #1 against #122.
Claude Opus 5.5 or Kimi K2 0905 Preview for Long context?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 0905 Preview in Long context at #1 against #151.