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I doubt anyone announces when they have under billed. OpenAI has also done many low price deals and quota resets.

But you have eyes, right? And a brain, and live through your own experience and can reason about it, right?

When was the last time someone undercharged you or didn't charge you at all by mistake?

Is this a common occurrence?

What's the proportion of overcharges vs. undercharges you have observed in your life?

Usually it's user's incentive to control over-billing and company's one to make sure there's no under-billing :)