kimi-k2-0905-preview vs Step 5 Preview
kimi-k2-0905-preview is cheaper on output tokens, while Step 5 Preview offers a larger context window. Choose kimi-k2-0905-preview or Step 5 Preview based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | kimi-k2-0905-preview | Step 5 Preview |
|---|---|---|
| Provider | 302.AI | StepFun |
| Input / 1M tokens | $0.63 | $1.00 |
| Output / 1M tokens | $2.53 | $2.70 |
| Context window | 262K | 1M |
| Parameters | — | — |
| Open weights | No | — |
| Released | Sep 2025 | — |
| SWE-bench Verified score | 71.2 | — |
| LMArena (Chatbot Arena) Elo score | 1380 | 1440 |
| LMArena WebDev Elo score | — | 1564 |
| LMArena Vision Elo score | — | 1267 |
FAQ
Is kimi-k2-0905-preview or Step 5 Preview cheaper?
kimi-k2-0905-preview is cheaper on output tokens ($2.53 vs $2.70 per 1M).
Which has the larger context window, kimi-k2-0905-preview or Step 5 Preview?
Step 5 Preview has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.