Language model
Kimi K3
Moonshot AI's flagship open model, for coding agents and long, multi-step tasks.
- Status
- Available
- Parameters
- 2.8T
- Active
- 104B
- Context
- 1M
- Best for
- Coding agents, long multi-step tasks, and the hardest problems
Model IDs
| Model ID | Use |
|---|---|
kimi-k3 | Coding agents and long, multi-step tasks |
Use one of the model IDs above with Chat Completions or Responses at https://tarka.rest/v1.
Pricing
kimi-k3: $2.97 input · $0.297 cached input · $14.85 output per million tokens
Overview
Kimi K3 is Moonshot AI’s open-weight model, released under the Kimi K3 License. It has 2.8 trillion parameters, 104 billion of them active for each token, and a context of about a million tokens. It always reasons before it answers.
When to pick it
- Coding agents that plan, edit, and test across a whole repository
- Long tool loops where the model has to keep track of many steps
- Hard problems where the quality of the answer matters more than speed or price
When to look elsewhere
- High-volume or latency-sensitive calls: start with GLM-5.3 Flash or DeepSeek V4.1 Flash
- Short, simple replies, where its reasoning adds time and tokens
In a tool loop
Send each assistant message back exactly as you received it, including
reasoning_content and tool_calls. Moonshot AI asks for the complete message
to be passed back: the model needs its earlier reasoning to stay on track.