Claude Opus 5.5 vs Kimi K3
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in 7 of 8 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
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 K3
Yes. Yes on General LLM (open weights); Reasoning (open weights). Not the overall leader.
| Category | Claude Opus 5.5 | Kimi K3 |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #13 · #13 in General LLM Margin 8.84353741496598 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in Reasoning Margin 5.479452054794521 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 | #17 · #17 in Science Margin — Epoch AI benchmarking hub · Jul 16, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Scale Labs leaderboards · Oct 14, 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 | #11 · Was SOTA · Coding › Web dev Margin 9.34579439252336 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #8 · Was SOTA · Long context Margin 5.442176870748298 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #22 · #22 in Vision Margin 60.526315789473685 Epoch AI benchmarking hub · Jul 16, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #19 · #19 in Factuality Margin 14.925373134328368 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 16, 2026 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Kimi K3: $4.125 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Kimi K3: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in General LLM at #2 against #13.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Reasoning at #1 against #7.
Science: As of Oct 14, 2026, Kimi K3 leads Claude Opus 5.5 in Science at #17 against #31.
Coding › Web dev: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Coding › Web dev at #1 against #11.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Long context at #1 against #8.
Vision: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Vision at #4 against #22.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Factuality at #1 against #19.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Abstraction (ARC) at #1 against #8.
Claude Opus 5.5 or Kimi K3?
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in 7 of 8 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, Vision, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or Kimi K3 for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in General LLM at #2 against #13.
Claude Opus 5.5 or Kimi K3 for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads Kimi K3 in Reasoning at #1 against #7.
Claude Opus 5.5 or Kimi K3 for Science?
As of Oct 14, 2026, Kimi K3 leads Claude Opus 5.5 in Science at #17 against #31.