class OutText(BaseModel):
    output: str

agent = client.create_agent(
    instructions="You are a good assistant.",
    name="assistant",
    default_options={
        "response_format": OutText
    },
)

async def main():
    result1 = await agent.run(
        "How many kilometers is the highway from Wuhan to Beijing?",
        thread=thread,
    )
    print(result1.text)