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🧪 This platform is in early beta. Features may change and you might encounter bugs. We appreciate your patience!

Crux

Enter any argument or claim. Crux identifies the single load-bearing premise — the one thing that, if false, makes the whole argument collapse.

⚠️ Limited mode — you're using free open-source models as a fallback. Results may be slower, less reliable, and significantly less accurate than frontier models. For the best experience, create an account and add your own API key. How to get an API key