What actions cost
If a Build or edit also produces a downloadable file, there is no separate artifact fee. It remains part of that same action.
When credits are kept
Mythos reserves the required balance when an action starts so the same credits cannot fund two runs at once.- A Plan turn is kept only after Mythos saves a durable response, set of questions, or plan draft.
- A Build or edit is kept only after a result is delivered.
- A failed or interrupted action releases its reservation automatically.
Actions that do not use credits
These actions do not start an AI run:- Editing and saving the Plan draft yourself.
- Approving or cancelling a Plan session. The Build started after approval has its own normal price.
- Editing a project file directly in the workspace editor.
- Viewing an earlier version or reverting to it.
- Publishing or republishing an already delivered project.
If the balance is too low
The action does not start when the available balance cannot cover its fixed price. Because public top-ups are not active during owner-only access, there is no checkout path to follow in these docs. If the displayed balance or a refund looks wrong, contact Mythos support with the project and action that produced the mismatch.Keep usage predictable
- Use Plan mode when a first request still has important open decisions.
- Ask for one coherent outcome per edit, then inspect the result before sending another.
- Use the workspace editor for a small change you already know how to make directly.
- Revert a poor direction before asking for more work on top of it.
