Grok Code Fast 1

Retired May 2026

xAI's coding-specialized reasoning model, released August 2025 and built for agentic coding workflows across TypeScript, Python, Rust and other languages.

Context: 256K tokens
Released: Aug 2025

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Capabilities

What Grok Code Fast 1 accepts and can do, as published by xAI.

Text Accepts and generates natural-language text.
Image Accepts images as input alongside text.
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.

Common 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.