Upcoming model deprecation — May 15, 2026. Several older models will be retired on May 15 at 12:00pm PT, including grok-4-1-fast, grok-4-fast, and grok-4. We recommend migrating to grok-4.3 for reasoning workloads and grok-4.20-non-reasoning for non-reasoning workloads. View the full migration guide for details and recommended replacements.

Get started with xAI

Build with intelligent, fast, and cost effective models across text, voice, images, and video.

Models

We offer a range of models supporting multiple use cases and modalities.

Grok 4.3

Excels at agentic reasoning, knowledge work, and tool use.

Context- tokens
Input- / 1M tokens
Output- / 1M tokens
View model

Voice API

Real-time conversations, speech-to-text, and text-to-speech.

Agent$3.00 / hour
TTS$4.20 / 1M characters
STT

Imagine API

Turn ideas into reality with image and video generation.

ModesGeneration & editing
Image- / image
Video- / second

Jump straight in

Try text, voice, image, and video models below

import os
from xai_sdk import Client
from xai_sdk.chat import user, system

client = Client(
    api_key=os.getenv("XAI_API_KEY"),
)

chat = client.chat.create(model="grok-4.3")
chat.append(system("You are Grok, a chatbot inspired by the Hitchhiker's Guide to the Galaxy."))
chat.append(user("What is the meaning of life, the universe, and everything?"))
response = chat.sample()

print(response)

Responses API

Generate text, have conversations, use tools, and build AI-powered applications.

Generate text
Multi-turn chat
Function calling
- / 1M input tokens
- / 1M output tokens