What is a fractional AI CTO?

“A fractional AI CTO is a senior AI engineering leader who works with you part-time — a few days a month instead of full-time — to own your AI strategy, decisions, and technical direction. You get the judgment of a Head of AI (what to build, build-vs-buy, model and vendor choice, architecture, risk) without a $200K–$400K salary (source: Glassdoor).”