Building with AI in 2026: Are fixed-price dev models actually viable?

Hey everyone!
The way software gets built is shifting fast, vibe coding, AI agents, MCP tooling, and we're seeing clients ask a big question:

"Can I get a production-ready product without open-ended billing?"

Curious how you're thinking about this:

— Have you worked with dev agencies? What broke down?

— Would a fixed-price, outcome-based model change how you scope projects?

— What's the #1 thing you wish your dev partner did differently?

Drop your thoughts below👇