Major Release Moonshot AI · Released
Kimi K2
What is Kimi K2?
Kimi K2 is a Major Release AI model from Moonshot AI, released on January 20, 2026. It has a 2M tokens context window, costs $0.15 per million input tokens, and scores 91.3% on MMLU. It is available as open source.
Moonshot's open-weight frontier MoE with strong agentic benchmarks.
First open-weight model to rank #1 on LMSYS Chatbot Arena with over 1 trillion parameters
Key features
- First open-weight model #1 on LMSYS Chatbot Arena
- 1.04 trillion parameters
- K2.5 agent swarms with up to 100 sub-agents
- $0.15/M input tokens
How much does Kimi K2 cost?
| Metric | Price |
|---|---|
| input per mtok | $0.15 |
| output per mtok | $2.50 |
Pricing data verified .
What context window does Kimi K2 have?
- Context window
- 2M tokens
- Max output
- 32K
- Input modalities
- text, image
- Output modalities
- text
How does Kimi K2 score on benchmarks?
| Benchmark | Score |
|---|---|
| MMLU | 91.3% |
| SWE-bench Verified | 65.8% |
| GPQA Diamond | 74.1% |
| LiveCodeBench | 68.9% |
Benchmark scores verified .
What's new
- 2M token context window (20x vs first Kimi)
- Agentic tool-use tuning via MuonClip optimizer
- Open weights under modified MIT
How does Kimi K2 compare to Moonshot Kimi?
- Context window: 1M tokens → 2M tokens