cli/dev/website/docs/llms/deepseek.md

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Connecting to LLMs	500

DeepSeek

Dev can connect to the DeepSeek.com API. To work with DeepSeek's models, you need to set the DEEPSEEK_API_KEY environment variable with your DeepSeek API key.
The DeepSeek Chat V3 model has a top score on dev's code editing benchmark.

python -m pip install -U dev-chat

export DEEPSEEK_API_KEY=<key> # Mac/Linux
setx   DEEPSEEK_API_KEY <key> # Windows, restart shell after setx

# Use DeepSeek Chat v3
dev --deepseek