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Code

V4 models run with thinking enabled by default, so you get reasoning_content out of the box. Use the use_thinking flag to control it.
cookbook/90_models/deepseek/thinking_mode.py
from agno.agent import Agent
from agno.models.deepseek import DeepSeek

# Thinking enabled (default) - returns reasoning_content
thinking_agent = Agent(model=DeepSeek(id="deepseek-v4-flash"), markdown=True)

# Thinking disabled - faster, no reasoning_content
non_thinking_agent = Agent(
    model=DeepSeek(id="deepseek-v4-flash", use_thinking=False),
    markdown=True,
)

if __name__ == "__main__":
    thinking_agent.print_response("Why is the sky blue?", stream=True)

    non_thinking_agent.print_response("Why is the sky blue?", stream=True)

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Usage

1

Set up your virtual environment

uv venv --python 3.12
source .venv/bin/activate
2

Set your API key

export DEEPSEEK_API_KEY=xxx
3

Install dependencies

uv pip install -U openai agno
4

Run Agent

python cookbook/90_models/deepseek/thinking_mode.py