Confirm this is an issue with the Python library and not an underlying OpenAI API

• This is an issue with the Python library

Describe the bug

The issue is that the base_url in the OpenAI client enforces a trailing slash whereas setting the module openai.base_url does not enforce.

This is 100% reproducible and while it can be worked around, the inconsistency in clients causes issues in scripts that use both clients.

To Reproduce

1. Create a module client and use a base_url without a trailing slash. See error with URL for completions
2. Create an OpenAIClient and use a base_url without a trailing slash. See no erros.

Code snippets

This works

    client = openai.OpenAI(
        api_key=my_key,
        base_url="https://myllmserver.com/api/v1"
    )
    print(client.completions.create(
       model="mistralai/Mistral-7B-Instruct-v0.2",
       prompt="test" 
    ))

This does not:

    openai.base_url="https://myllmserver.com/api/v1"
    openai.api_key=my_key
    print(openai.completions.create(
       model="mistralai/Mistral-7B-Instruct-v0.2",
       prompt="test"
    ))

Error:

https://myllmserver.com/api/v1completions "HTTP/1.1 404 Not Found"

OS

macOS

Python version

Python v3.12

Library version

openai v1.23.6