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xAI’s Grok provides advanced reasoning capabilities and real-time knowledge. The plugin supports conversation memory, streaming responses, and function calling (Grok 4.1+).
Vision Agents requires a Stream account for real-time transport. Most providers offer free tiers to get started.

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Installation

uv add "vision-agents[xai]"

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Quick Start

from vision_agents.core import Agent, User
from vision_agents.plugins import xai, getstream, deepgram, elevenlabs

agent = Agent(
    edge=getstream.Edge(),
    agent_user=User(name="Assistant", id="agent"),
    instructions="You are a helpful assistant.",
    llm=xai.LLM(model="grok-4.1"),
    stt=deepgram.STT(),
    tts=elevenlabs.TTS(),
)
Set XAI_API_KEY in your environment or pass api_key directly.

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Parameters

NameTypeDefaultDescription
modelstr"grok-4"Model ("grok-4", "grok-4.1")
api_keystrNoneAPI key (defaults to XAI_API_KEY env var)

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Function Calling

Grok 4.1+ supports function calling: 
@agent.llm.register_function(description="Get weather for a location")
async def get_weather(location: str) -> str:
    return f"The weather in {location} is sunny and 72°F"
See the Function Calling guide for details.

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Events

The xAI plugin emits a low-level event for streaming chunks. Most developers should use the core LLMResponseCompletedEvent instead. 
from vision_agents.plugins.xai.events import XAIChunkEvent

@agent.events.subscribe
async def on_xai_chunk(event: XAIChunkEvent):
    print(f"Chunk: {event.chunk}")

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Next Steps

Build a Voice Agent

Get started with voice

Build a Video Agent

Add video processing