Retired May 2026
Grok Code Fast 1
xAI's coding-specialized reasoning model, released August 2025 and built for agentic coding workflows across TypeScript, Python, Rust and other languages.
Key Specifications
- Context window
- 256K tokens
- Released
- Inputs
- Text, image
- Capabilities Show details
- Reasoning Thinks before it answers, always on or as a switchable mode. Function calling Connect to external tools, APIs, and systems. Structured output Return responses in structured formats like JSON.
Frequently Asked Questions
What is Grok Code Fast 1 good for?
Agentic coding in TypeScript, Python, Rust and other languages: it was xAI's coding model from August 2025 until its retirement.
When is Grok Code Fast 1 not a good fit?
Any new work: xAI retired it in May 2026, and its migration guide points to Grok Build 0.1. No built-in web search or code execution, and closed weights.
Can I self-host Grok Code Fast 1?
No. xAI does not publish the weights; Grok Code Fast 1 is available only through hosted APIs.
More from xAI
| Model | Context | Input /1M | Output /1M |
|---|---|---|---|
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Grok 4.1 Fast (Reasoning)
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Grok 4
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