The selected model has been deprecated. Learn more here: https://platform.openai.com/docs/deprecations.

The 404 error you are encountering when using the gpt-3.5-turbo-0301 model or similar models can be attributed to several reasons:

1. Incorrect Endpoint: The gpt-3.5-turbo models are chat models and need to be accessed through the v1/chat/completions endpoint, not the v1/completions endpoint. Using the wrong endpoint can result in a 404 error.

2. Model Deprecation: The gpt-3.5-turbo-0301 model might have been deprecated or modified in behavior, leading to compatibility issues. There have been reports of sudden changes in behavior and token limit errors with this model, suggesting internal changes or deprecation.

3. API Version Changes: Recent changes in the OpenAI Python package, particularly in version 1, have introduced breaking changes that might affect how models are accessed. Ensuring you are using the correct API version and endpoints is crucial.

4. Resource Not Found: If the model or the specific version of the model you are trying to access is not available or has been moved, it will result in a 404 error. This could be due to the model being deprecated or not being available on the server.

These factors collectively contribute to the 404 errors when attempting to use the gpt-3.5-turbo-0301 model.