OpenAIProvider Does Not Read OPENAI_BASE_URL from Environment Variables

[hrahmadi71]

Initial Checks

• I confirm that I'm using the latest version of Pydantic AI

Description

When creating a new instance of OpenAIProvider like this:

provider = OpenAIProvider()

If the OPENAI_BASE_URL environment variable is set, it is expected that provider.base_url should reflect that value. However, it is not being read from the environment variables, and instead, provider.base_url defaults to 'https://api.openai.com/v1'.

Example Code

import os
from pydantic_ai.providers.openai import OpenAIProvider

# Set the environment variable
custom_openai_base_url = "https://custom-openai.com/v1"
os.environ["OPENAI_BASE_URL"] = custom_openai_base_url

# Create an instance of OpenAIProvider
provider = OpenAIProvider()

# Check if the base_url is set correctly
print(f"Expected: {custom_openai_base_url}")
print(f"Actual: {provider.base_url}")

Python, Pydantic AI & LLM client version

0.0.39