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The core of any agent is its model. Models are AI systems that transform input data into useful language outputs. They can understand natural language, reason about context, and generate text, powering the capabilities of Agents. You can specify any model you prefer by passing the model argument to Agent.start(): 
from autonomy import Agent, Model, Node


async def main(node):
  await Agent.start(
    node=node,
    name="henry",
    instructions="You are Henry, an expert legal assistant",
    model=Model("claude-sonnet-4-v1")
  )


Node.start(main)
The code above changes the agent to use the claude-sonnet-4-v1 model. To use llama4-maverick change the model to:
images/main/main.py
from autonomy import Agent, Model, Node


async def main(node):
  await Agent.start(
    node=node,
    name="henry",
    instructions="You are Henry, an expert legal assistant",
    model=Model("llama4-maverick")
  )


Node.start(main)
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