OpenAI's responses.parse() and pydantic model

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We often encounter the situation when we need LLM to generate structured data in its response. And very often, JSON is the desired data format. We can use few-shots and even provide tools to generate them.

In the OpenAI's 2025-04-01-preview version, we have the text_format parameter for instructing LLM to generate these JSON response adhering to a pydantic model. The generated response are Python class instance.

Source code is available here. The main code is here.