Pricing & Cost Calculation

How is cost calculated?

traceknot matches each step’s model and token usage against a maintained list of current provider prices, and adds it up per session. That covers the input/output split, the discounted rate for cached tokens, and any extra per-use fees a provider charges for specific tools (for example, some providers bill web search separately from regular tokens).

Why does a session show no cost, or $0.00?

That means the model used in that session isn’t in the pricing list yet — almost always because it’s a model that launched very recently. New models are typically added within a day of release. Once the update lands, cost for that model is calculated correctly going forward, and sessions already recorded with that model are recalculated too — you don’t need to re-run anything.

If a number doesn’t add up

Pricing lists are maintained by hand and can lag a provider’s own pricing page, or miss a discount tier. If a session’s cost looks wrong to you, open an issue on GitHub with the session id and what you expected — that’s the fastest way to get a pricing fix shipped.