Change, upgrade or cancel your plan
Chat plans and developer plans are billed separately. You can change either at any time.
Cerelith has two kinds of plans:
- Chat plans for talking to Cerelith in the app.
- Developer plans for using the brain from your own software through the API.
Open Plans and billing to start, change or cancel either one. When you upgrade, the new limits apply straight away and you pay the difference at once. When you move to a smaller plan, the difference is credited to your next invoice. When you cancel, the plan runs until the end of the period you paid for and then returns to Free.
Paying yearly costs the same as ten months.
Updated 28 October 2026