What 'paid usage' actually means (this catches teams out)
Paid usage is *cumulative billed dollars*, not deposit balance, not credit balance, and not pre-purchased credits in your account. Adding $1,000 in prepaid credit on day 1 does not promote you to Tier 5 on day 1 — what counts is dollar consumption against the API after billing. If you have $1,000 of credit but have used $87 of it, you are at Tier 3.
Credits from free trials, partner promotions, or referral bonuses do not count toward tier thresholds. Only payments made against your linked payment method (or prepaid credit you actually consumed via API calls) count. This is the single most common reason teams sit at Tier 1 with a $5,000 credit balance — they assume credits = paid usage.
Monthly usage caps are not the same as tier thresholds. The cap is the maximum you can spend in a calendar month at your current tier (Tier 5's $200,000/month is the ceiling — request an increase via help.openai.com if you need more). The threshold is what you have already spent across the lifetime of your billing account.