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Example showing how to configure a basic Reasoning Agent, using the reasoning=True flag.
1

Add the following code to your Python file

basic_cot.py
from agno.agent import Agent
from agno.models.openai import OpenAIResponses

task = (
    "Analyze the key factors that led to the signing of the Treaty of Versailles in 1919. "
    "Discuss the political, economic, and social impacts of the treaty on Germany and how it "
    "contributed to the onset of World War II. Provide a nuanced assessment that includes "
    "multiple historical perspectives."
)

reasoning_agent = Agent(
    model=OpenAIResponses(id="gpt-5.2"),
    reasoning=True, # The Agent will be able to reason.
    markdown=True,
)
reasoning_agent.print_response(task, stream=True, show_full_reasoning=True)
2

Set up your virtual environment

uv venv --python 3.12
source .venv/bin/activate
3

Install dependencies

uv pip install -U openai agno
4

Export your OpenAI API key

  export OPENAI_API_KEY="your_openai_api_key_here"
5

Run Agent

python basic_cot.py