Claude Opus 5.5 vs Kimi K2 5 Thinking
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, 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 5 Thinking
It used to be. Was SOTA in Coding › Web dev.
| Category | Claude Opus 5.5 | Kimi K2 5 Thinking |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #70 · #70 in General LLM Margin 37.234042553191486 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #73 · #73 in Reasoning Margin 39.361702127659576 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 | #67 · #67 in Coding › Web dev Margin 52.8 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #69 · #69 in Long context Margin 36.70212765957446 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #71 · #71 in Factuality Margin 41.86046511627907 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 5 Thinking: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
Kimi K2 5 Thinking: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in General LLM at #2 against #70.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in Reasoning at #1 against #73.
Coding › Web dev: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in Coding › Web dev at #1 against #67.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in Long context at #1 against #69.
Factuality: As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in Factuality at #1 against #71.
Claude Opus 5.5 · Kimi K2 5 Thinking
Claude Opus 5.5 or Kimi K2 5 Thinking?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Opus 5.5 or Kimi K2 5 Thinking for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in General LLM at #2 against #70.
Claude Opus 5.5 or Kimi K2 5 Thinking for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in Reasoning at #1 against #73.
Claude Opus 5.5 or Kimi K2 5 Thinking for Coding › Web dev?
As of Oct 15, 2026, Claude Opus 5.5 leads Kimi K2 5 Thinking in Coding › Web dev at #1 against #67.