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Grok Build 0.1

Grok Build 0.1 is xAI's coding model purpose-built for agentic software engineering workflows. It supports tool calling, structured outputs, text and image input, and a context window of 256K tokens, with always-on reasoning for multi-step development tasks.

ReasoningImplicit CachingVision (Image)Tool UseWeb Search
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-build-0.1',
  prompt: 'Why is the sky blue?'
})
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About Grok Build 0.1

Grok Build 0.1 was released May 20, 2026 as xAI's coding model purpose-built for agentic software engineering. Where general-purpose Grok models handle coding alongside other tasks, Grok Build 0.1 is trained to act as an autonomous engineering agent: refactoring code, invoking tools, producing structured outputs, and iterating through multi-step tasks until completion.

Reasoning is always active on Grok Build 0.1. There is no non-reasoning mode and reasoning effort is not configurable, so every response includes structured analysis before the final output. The model accepts text and image input, which means it can read diagrams, UI mockups, and error screenshots alongside source code. It supports tool calling and structured outputs, which fits agent loops that orchestrate file edits, test runs, and external APIs.

Grok Build 0.1 operates within a context window of 256K tokens and is available through Vercel AI Gateway at $1 per million input tokens, $2 per million output tokens, and $0.2 per million cached input tokens. The cached input rate makes it economical to reuse long codebase prefixes across many agent steps.