The question Most "production-grade" AI tools ship on paid endpoints — OpenAI, Anthropic, Gemini Pro. That's the safe choice. It's also the expensive one. I wanted to know: in mid-2026, can free 70B-class open-source endpoints actually carry a real product workload? Not a toy chatbot — a tool that generates working HTML/CSS/JS for arbitrary user prompts. So I built one. The result is Sitecraft ( wiz-craft.vercel.app ) — a free, open-source AI website builder. It runs across four different free endpoints and lets users switch between them mid-conversation. This post is what I learned about each one. Not a benchmark — a working engineer's notes.…