Simon Willison’s Weblog

googleapis/python-genai. Google released this brand new Python library for accessing their generative AI models yesterday, offering an alternative to their existing generative-ai-python library.

The API design looks very solid to me, and it includes both sync and async implementations. Here's an async streaming response:

async for response in client.aio.models.generate_content_stream(
    model='gemini-2.0-flash-exp',
    contents='Tell me a story in 300 words.'
):
    print(response.text)

It also includes Pydantic-based output schema support and some nice syntactic sugar for defining tools using Python functions.