Gemini 4 Argon
Claude Opus 5.5
Muse Wonder
MiMo-V2.6-Pro
Qwen3.8-Max
GLM-5.3
GPT-5.5
ERNIE 5.1
DeepSeek-V4.1-Flash-20260910
Grok 4.20 Beta
amazon-nova-experimental-chat
Dola Seed 2.0 Pro
NVIDIA-Nemotron-3-Ultra-550B-A55B
Gemma 4 31B
Step 5 Preview
Kimi K2 Preview
Kimi K2 Preview is an open-weight model from Moonshot AI, released Sep 4, 2025. It ranks #175 of 351 on the LMArena text leaderboard with a rating of 1380. It costs $0.60 per million input tokens and $2.50 per million output tokens, with a 256K-token context window.
- Developer
- Moonshot AI
- Released
- Sep 4, 2025
- Context window
- 256K
- Price in / out, per 1M tokens
- $0.60 / $2.50
- Weights
- Open · Modified MIT
- Inputs
- Text
- Reasoning
- No
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 28.8K
- Hugging Face likes
- 790
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1380 | 175 / 351 | 11.6K |
| CodingLMArena | 1399 | 176 / 346 | 2.2K |
| MathLMArena | 1397 | 166 / 339 | 754 |
| Creative writingLMArena | 1350 | 166 / 349 | 1.5K |
| Instruction followingLMArena | 1348 | 190 / 351 | 2.9K |
| Hard promptsLMArena | 1384 | 176 / 351 | 5.6K |
| Multi-turnLMArena | 1371 | 182 / 349 | 4.6K |
| Long queriesLMArena | 1353 | 198 / 330 | 2.6K |
| ExpertLMArena | 1365 | 186 / 305 | 575 |
| Legal and governmentIndustries | 1403 | 154 / 325 | 768 |
| Medicine and healthcareIndustries | 1383 | 181 / 325 | 719 |
| Business and financeIndustries | 1354 | 190 / 344 | 2K |
| ChineseLanguages | 1415 | 172 / 328 | 956 |
| SpanishLanguages | 1388 | 162 / 249 | 390 |
| GermanLanguages | 1387 | 136 / 261 | 278 |
| FrenchLanguages | 1382 | 169 / 252 | 218 |
| JapaneseLanguages | 1349 | 129 / 236 | 209 |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (Kimi K2 Preview (0905), Kimi K2 Preview (0711)).
Compare Kimi K2 Preview
Moonshot AI
The lab behind Kimi, known for long-context and agentic open-weight models. Founded 2023, based in Beijing. moonshot.ai
Questions
Who makes Kimi K2 Preview?
Kimi K2 Preview is made by Moonshot AI, founded 2023 and based in Beijing.
How much does Kimi K2 Preview cost?
$0.60 per million input tokens and $2.50 per million output tokens, at its provider’s list price.
What is Kimi K2 Preview’s context window?
256K tokens (262,144).
How does Kimi K2 Preview rank?
#175 of 351 on LMArena’s text leaderboard, rated 1380 (95% interval 1374–1387) from 11,586 votes, as of Oct 22, 2026.
Is Kimi K2 Preview open source?
Kimi K2 Preview has open weights under the Modified MIT license, downloadable from Hugging Face (moonshotai/Kimi-K2-Instruct-0905).