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* Allow overriding API URL through ``OPENAI_API_URL`` environment variable.
Thanks to `Stefano d'Antonio`_, `Issue 5`, `PR 6`_.
.. _`Stefano d'Antonio`: https://github.com/UnoSD
.. _`Issue 5`: https://github.com/peterdemin/openai-cli/issues/5
.. _`PR 6`: https://github.com/peterdemin/openai-cli/pull/6