Kimi K3 vs Step 3.5 Flash
As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Kimi K3
Yes. Yes on General LLM (open weights); Reasoning (open weights). Not the overall leader.
Step 3.5 Flash
#99 Best current rank: #99 in Factuality, as of Oct 14, 2026.
| Category | Kimi K3 | Step 3.5 Flash |
|---|---|---|
| General LLM | #13 · #13 in General LLM Margin 8.84353741496598 LMArena leaderboard dataset · Oct 13, 2026 | #123 · #123 in General LLM Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #7 · #7 in Reasoning Margin 5.479452054794521 LMArena leaderboard dataset · Oct 13, 2026 | #124 · #124 in Reasoning Margin 85.61643835616438 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 | — |
| 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 | #119 · #119 in Long context Margin 80.95238095238095 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 | #99 · #99 in Factuality Margin 74.6268656716418 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #8 · #8 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 16, 2026 | — |
Kimi K3: $4.125 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
Kimi K3: open weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in General LLM at #13 against #123.
Reasoning: As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in Reasoning at #7 against #124.
Long context: As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in Long context at #8 against #119.
Factuality: As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in Factuality at #19 against #99.
Kimi K3 or Step 3.5 Flash?
As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Kimi K3 or Step 3.5 Flash for General LLM?
As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in General LLM at #13 against #123.
Kimi K3 or Step 3.5 Flash for Reasoning?
As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in Reasoning at #7 against #124.
Kimi K3 or Step 3.5 Flash for Long context?
As of Oct 14, 2026, Kimi K3 leads Step 3.5 Flash in Long context at #8 against #119.