Show HN: LLM Opinion – discover what sources an LLM relies on

Hi HN,

I built a simple tool that shows what an LLM (OpenAI model) thinks about any product — both based on its internal knowledge and web search. It also shows which sources the model relied on. You can download the analysis as a JSON file or share it via link.

I’m using:

- openai/gpt-4.1-mini for queries that require search

- openai/gpt-4.1-nano for those that don’t

Since the product is completely free, I’m sticking with the cheaper models. I do have a cost cap :)

Tech-wise, it’s a Python backend with FastAPI and some Node.js. I’m tracking analytics with PostHog: mainly unique users and search queries.

Next steps I’m considering:

- Open-sourcing it and letting users provide their own OpenAI API keys

- Adding smarter models, deeper analysis, and customizable categories behind a paywall

Would be great to hear where you see this being useful.

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Show HN: LLM Opinion – discover what sources an LLM relies on

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