Buying Code Problems That Current LLMs Cannot Solve

I would like to purchase a handful of code problems that modern LLMs can’t solve. Requirements: - programmatically verifiable (can be tested without human interaction) - “before” state (repo before the commit that implements the solution) - example code that actually solves the problem I am willing to pay up to $500 per problem that I can easily test locally and confirm current models (gpt-5.3-codex, opus 4.6) are unable to solve. If you can’t tell, I’m running out of “too hard for LLM” code tasks 🙃🙃🙃