When 'getting faster' isn't the same as 'getting better'

Anthropics February 2026 study classified 11 observable collaboration behaviors across 9,830 Claude conversations. Things like how often you delegate multi-step reasoning, how much you describe context versus just issue commands, whether you push back on outputs or accept the first result. They called it the AI Fluency Index. I'd been using Claude Code daily for months. When I read the study I realized I couldn't honestly say which of those 11 behaviors I was actually using — or which ones I nev