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DeepSeek V4 models run with thinking mode enabled by default, so you get reasoning_content out of the box. Use the use_thinking flag to control it: use_thinking=True forces it on, use_thinking=False turns it off for a faster, cheaper response.
thinking_mode.py

Run the Example

1

Set up your virtual environment

2

Install dependencies

3

Export your DeepSeek API key

4

Run the example

Save the code above as thinking_mode.py, then run:
Full source: cookbook/90_models/deepseek/thinking_mode.py