Earlier quoted context omitted.
Looks quite similar to my https://llm.datasette.io tool as well. Honestly though, CLI tools for accessing LLMs (including piping content in and out of them) is such a clearly good idea I'm glad to see more tools implementing the pattern.
It's very surprising that it has taken this long to see a first-party CLI like this.
pip install openai
export OPENAI_API_KEY="..."
openai api completions.create \
--model gpt-4.1-mini \
--prompt "tell a joke about a fish"