What $20K on Devin Looks Like, and Claude's Adoption Problem

A solo founder's $20K/month Devin experiment gives us the most concrete data yet on what AI agents cost at operational scale, while Simon Willison flags a meaningful market signal: Anthropic's best model is struggling to attract users even as the company grows. Meanwhile, Vercel Sandbox going globally available quietly closes a gap that was limiting what AI coding tools could do in production.