Premium request billing with third-party cli's

[b1ue-man]

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Bug

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I'd like to report a bug that I noticed with third-party cli tools, specifically opencode, in billing of premium requests.
In opencode agents can be configured to use a specific model.
As was already mentioned in other bug reports like here billing of higher tier subagents can be bypassed when a agent with a lower multiplier spawns them, or even be free when a agent like gpt-5-mini is used.
microsoft/vscode#292452
This seems to have been fixed Client-Side, but no protection was added on the Copilot endpoints as it seems.
So third-party apps like opencode can still exploit this loophole.
I'd consider managing paying in a way that the multiplier of the most expensive model used in a user request is charged.
That aside, the account is not charged no matter if the initial request is made with copilot as provider or not.

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