Grok Code Fast 1 API
About
Build advanced reasoning agents with Grok Code Fast 1, 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. Access Grok Code Fast 1 via the OpenCode Zen API with up to 256K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
256K
Tokens
Input Limit
256K
Tokens
Max Output
256K
Tokens
Pricing
Standard (per 1M tokens)
Input
Free
Output
Free
Caching (per 1M tokens)
Read
Free
Write
Free
Frequently Asked Questions
Grok Code Fast 1 by OpenCode Zen costs Free per 1M input tokens and Free per 1M output tokens. Cached reads cost Free per 1M tokens. Cache writes cost Free per 1M tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
OPENCODE_API_KEY
API Base URL
https://opencode.ai/zen/v1