What powers each plan

This article names the AI engines behind each plan and how Blue routes between them.

How the routing works

The strongest engines go to the artifacts; the efficient ones go to the flow. Everyday conversation happens hundreds of times a week: it needs to be quick, warm, and affordable. The synthesis work (your reviews, your weekly profile diff, the nightly refresh of your Living Profile) happens rarely, and it's where depth is actually felt. So that's where the most capable engines are spent.

Plan by plan

• Free runs conversation on Claude Haiku, a fast, genuinely capable model. Free is real Blue with a shorter memory, not a degraded one.
• Plus runs conversation on Claude Sonnet, a step up in nuance and steadiness. Your nightly distillation, Living Profile refresh, and weekly reviews run on Sonnet too.
• Pro runs conversation on the same Claude Sonnet, and moves the weekly synthesis up to Claude Opus, the deepest engine we use. Standing intentions execute on fast models, because every action they take waits for your explicit approval anyway; the thinking that matters happened before you tapped.

Two more things:

• What separates Pro from Plus is not a smarter chat partner: it's Blue acting on your behalf, plus deeper synthesis.
• Engines change as the field moves. When we upgrade one, this page changes with it: the plan promise ("being seen" on Plus, "Blue acts" on Pro) is the constant.

If anything here doesn't match what you experience, tell us.