Kimi K3 vs O3 Mini
As of Oct 14, 2026, Kimi K3 leads O3 Mini in 4 of 5 shared categories: Reasoning, Science, Long context, and Abstraction (ARC).
Kimi K3
Yes. Yes on General LLM (open weights); Reasoning (open weights). Not the overall leader.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | Kimi K3 | O3 Mini |
|---|---|---|
| General LLM | #13 · #13 in General LLM Margin 8.84353741496598 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #7 · #7 in Reasoning Margin 5.479452054794521 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 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 | #17 · #17 in Science Margin — Epoch AI benchmarking hub · Jul 16, 2026 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Coding | #— · Not enough data Margin — Scale Labs leaderboards · Oct 14, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #11 · Was SOTA · Coding › Web dev Margin 9.34579439252336 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #8 · Was SOTA · Long context Margin 5.442176870748298 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #22 · #22 in Vision Margin 60.526315789473685 Epoch AI benchmarking hub · Jul 16, 2026 | — |
| Factuality | #19 · #19 in Factuality Margin 14.925373134328368 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 16, 2026 | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
Kimi K3: $4.125 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
Kimi K3: open weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads Kimi K3 in General LLM at #7 against #13.
Reasoning: As of Oct 14, 2026, Kimi K3 leads O3 Mini in Reasoning at #7 against #133.
Science: As of Oct 14, 2026, Kimi K3 leads O3 Mini in Science at #17 against #76.
Long context: As of Oct 14, 2026, Kimi K3 leads O3 Mini in Long context at #8 against #145.
Abstraction (ARC): As of Oct 14, 2026, Kimi K3 leads O3 Mini in Abstraction (ARC) at #8 against #51.
Kimi K3 or O3 Mini?
As of Oct 14, 2026, Kimi K3 leads O3 Mini in 4 of 5 shared categories: Reasoning, Science, Long context, and Abstraction (ARC).
Kimi K3 or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads Kimi K3 in General LLM at #7 against #13.
Kimi K3 or O3 Mini for Reasoning?
As of Oct 14, 2026, Kimi K3 leads O3 Mini in Reasoning at #7 against #133.
Kimi K3 or O3 Mini for Science?
As of Oct 14, 2026, Kimi K3 leads O3 Mini in Science at #17 against #76.