Kimi K3 (Free) API
About
Build advanced reasoning agents with Kimi K3 (Free), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, native tool calling support, open weights architecture. Access Kimi K3 (Free) via the ZenMux API with up to 131K output tokens.
Capabilities
Input Modalities
textimagevideo
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsOpen
Temperature
Fixed
Attachment
Supported
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
131K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Caching (per 1M tokens)
Read
Free
Frequently Asked Questions
Kimi K3 (Free) by ZenMux costs Free per 1M input tokens and Free per 1M output tokens. Cached reads cost Free per 1M tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
ZENMUX_API_KEY
API Base URL
https://zenmux.ai/api/v1