Generate streaming text content with Generative Model

This sample demonstrates how to use Generative Models to generate text in a streaming format.

Code sample

Python

Before trying this sample, follow the Python setup instructions in the Vertex AI quickstart using client libraries. For more information, see the Vertex AI Python API reference documentation.

To authenticate to Vertex AI, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from google import genai
from google.genai.types import HttpOptions

client = genai.Client(http_options=HttpOptions(api_version="v1"))
response_text = ""
for chunk in client.models.generate_content_stream(
    model="gemini-2.0-flash-001",
    contents="Why is the sky blue?",
):
    print(chunk.text, end="")
    response_text += chunk.text
# Example response:
# The
#  sky appears blue due to a phenomenon called **Rayleigh scattering**. Here's
#  a breakdown of why:
# ...

What's next

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