[Bug]: UnicodeDecodeError when importing litellm_model on Windows

[Hamzah-syed]

• Have you read the docs?Agents SDK docs: Yes
• Have you searched for related issues? Others may have faced similar issues.: Yes, no similar issues found.

Describe the bug

When importing litellm_model from agents.extensions.models, a UnicodeDecodeError occurs on Windows systems.

Debug information

Agents SDK version: 0.0.13
Python version: 3.11
Operating System: Windows 11
Package manager: UV

Repro steps

1. pip install openai-agents[litellm]
2. from agents.extensions.models import litellm_model
3. uv run main.py

[MoosaAfzal2]

Encountering same error on windows 10 with sdk version 0.0.13 and python version 3.12