October 17, 2026 For years, AI training has been dominated by verifiable tasks. Write code that passes tests. Solve math that checks out. Play games with clear win conditions. The reward function is simple: you either got it right or you didn't. But most of the work that matters doesn't work that way. Writing a legal memo that balances competing interests. Building a financial model that tells a coherent story. Crafting a voice message that makes someone feel loved. There's no unit ...