The billing page nobody opens
Intercom's Fin is the clearest case to study, because it publishes the mechanics instead of saving them for a sales call. Fin is priced at $0.99 per outcome, on top of a base plan of $49 a month that includes 50 resolutions. Unused resolutions do not roll over.
Fair enough. The question is what counts as an outcome.
Fin records a resolution when the customer confirms the answer was satisfactory, or when the customer "exits the conversation without requesting further assistance." Go quiet for 24 hours after Fin's last answer and that is logged as an assumed resolution. Intercom's own pricing documentation is unusually direct about the uncomfortable case: a customer who leaves after Fin's answer without asking for more help "is counted as an Assumed Resolution and billed at $0.99."
Read that as an owner rather than as a support manager. A shopper who asks about a late order, gets an answer that does not help, gives up, closes the tab, and emails you instead has just been recorded as a success and charged for.
To be fair to Intercom, the same page lists what is not billed, and the list is reasonable. A customer who asks outright for a human. A customer whose frustration Fin detects, triggering its own escalation. A procedure that fails technically. A conversation abandoned after Fin asked a clarifying question rather than gave an answer. Intercom even names the countermeasure: configure escalation rules so the assistant hands off when it senses frustration, instead of letting the conversation die quietly into a paid resolution.
That setting, not the model, is what your evaluation call should be about.
The arithmetic matters more than the unit price, too. A thousand billed outcomes in a month is $990 plus the base plan, and the share of your chat volume that turns into billed outcomes is partly a configuration decision and partly not. Run a trial on real traffic and bill yourself before you model anything.