Grok Build 0.1 Is Now Available in Puter.js

Puter.js now supports Grok Build 0.1, xAI's fast coding model trained specifically for agentic software engineering workflows. It's purpose-built for interactive coding agents, tool use, and multi-step development tasks rather than general-purpose conversation.

What is Grok Build 0.1?

Grok Build 0.1 is the model that powers xAI's Grok Build CLI, an agentic command-line tool that can plan projects, write and edit files, execute shell commands, and build complete applications from natural language prompts. It accepts text and image inputs and supports a 256K token context window with built-in reasoning that is always active.

Key highlights:

• 256K Token Context — large enough to fit entire repositories, long traces, or multi-file diffs in a single request
• Always-On Reasoning — built-in step-by-step thinking before responding, tuned for code planning and multi-step execution
• Agentic By Design — trained for tool calling, structured outputs, and long-horizon workflows where the model edits files, runs commands, and recovers from failures
• Multimodal Input — accepts images alongside text, useful for screenshots, design mocks, and diagrams
• Accessible Pricing — $1 per million input tokens and $2 per million output tokens, well below most frontier coding models

Examples

Code generation

puter.ai.chat(
    "Write a Python function that implements a thread-safe LRU cache with a configurable max size",
    { model: 'x-ai/grok-build-0.1' }
);

Bug fixing

puter.ai.chat(`Fix this code that should reverse a linked list but doesn't work:
def reverse(head):
    prev = None
    while head:
        head.next = prev
        prev = head
        head = head.next
    return prev`,
  { model: 'x-ai/grok-build-0.1' }
);

Code refactoring

puter.ai.chat(
    "Refactor this class to use the repository pattern:\n\nclass UserService {\n  getUser(id) { return db.query('SELECT * FROM users WHERE id = ?', [id]); }\n  saveUser(user) { return db.query('INSERT INTO users VALUES (?)', [user]); }\n}",
    { model: 'x-ai/grok-build-0.1' }
);

Tool calling

function runShell(command) {
    const mockOutputs = {
        'ls': 'package.json\nsrc\nREADME.md',
        'pwd': '/home/user/project',
    };
    return mockOutputs[command] || 'command not found';
}

const tools = [{
    type: "function",
    function: {
        name: "run_shell",
        description: "Run a shell command and return its stdout",
        parameters: {
            type: "object",

function runShell(command) {
    const mockOutputs = {
        'ls': 'package.json\nsrc\nREADME.md',
        'pwd': '/home/user/project',
    };
    return mockOutputs[command] || 'command not found';
}

const tools = [{
    type: "function",
    function: {
        name: "run_shell",
        description: "Run a shell command and return its stdout",
        parameters: {
            type: "object",
            properties: {
                command: {
                    type: "string",
                    description: "The shell command to execute"
                }
            },
            required: ["command"]
        }
    }
}];

const userInput = "What files are in the current directory?";
const completion = await puter.ai.chat(userInput, {
    model: 'x-ai/grok-build-0.1',
    tools,
});

if (completion.message.tool_calls?.length > 0) {
    const toolCall = completion.message.tool_calls[0];
    const args = JSON.parse(toolCall.function.arguments);
    const output = runShell(args.command);

    const finalResponse = await puter.ai.chat([
        { role: "user", content: userInput },
        completion.message,
        {
            role: "tool",
            tool_call_id: toolCall.id,
            content: output
        }
    ], { model: 'x-ai/grok-build-0.1' });

    console.log(finalResponse);
}

Screenshot to code

puter.ai.chat(
    "Generate the HTML and CSS needed to recreate the UI shown in this screenshot",
    "https://assets.puter.site/example-ui.png",
    { model: 'x-ai/grok-build-0.1' }
);

Get Started Now

Just add one library to your project:

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

Or add one script tag to your HTML:

<script src="https://js.puter.com/v2/"></script>

No API keys and no infrastructure setup. Start building with Grok Build 0.1 immediately.

Learn more:

• Free, Unlimited Grok API
• Puter.js AI Documentation