You're still using AI alone. The dominant mental model for AI in 2026 is still one person, one tool, one output. You prompt it. It responds. You copy the result somewhere else. Someone else on your team never sees how you got there. That model made sense when AI was a novelty. It doesn't make sense anymore. The teams that are actually moving fast aren't using better prompts. They're using shared environments where the agent has context on the whole project, where everyone in the group chat can benefit from the same tool, and where the agent remembers what was decided last week. Solo AI is a calculator. Shared AI is infrastructure. The gap between those two things is going to be obvious in retrospect. It already is to the people who've made the switch.