v0.1.8 Raising pydantic errors

[vg249]

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

New stable version v0.1.8 is raising Fields must not use names with leading underscores; e.g., use 'pydantic_extra__' instead of '__pydantic_extra__'.

To Reproduce

import openai
openai_client = openai.OpenAI()
openai_response = openai_client.embeddings.create(input=["test"], model="text-embedding-ada-002")

Code snippets

OS

Ubuntu

Python version

3.10.12

Library version

openai 1.108.0

[RobertCraigie]

What version of pydantic are you using?

[Kdsingh333]

Same issue.
Fields must not use names with leading underscores; e.g., use 'pydantic_extra__' instead of '__pydantic_extra__'.
pydantic version : 2.5.0
openai version : 1.99.1

[RobertCraigie]

Can you update to the latest pydantic version? I cannot reproduce this with pydantic version 2.11.9

[a-kuchynski]

Same issue
langchain-openai==0.3.29
openai==1.108.0
pydantic==2.7.4
pydantic-settings==2.10.1
pydantic_core==2.18.4

[ssakib7]

Same issue.
Fields must not use names with leading underscores; e.g., use 'pydantic_extra__' instead of 'pydantic_extra'.

pydantic version : 2.5.0

[alexwayne]

Same issue. I am using pydantic version 2.7.1

update 9/22/2025

Solved also by updating it to 2.11.9. Thanks for the help.

[segmentation-hoe]

Same here with pydantic 2.7.4, solved by updating it to 2.11.9

[RobertCraigie]

see #2644 for tracking, in the meantime you can workaround this by updating your pydantic version to the latest

[Joel-Hunt]

I am getting the same error and I am using:

openai 1.108.2
pydantic 2.11.9

Not sure if it is because I am on 1.108.2 and others were on 1.108.0?

[saisurbehera]

Updated to 2.11.9 and solved the issue for me!