The credit-quota shift: why 'unlimited' isn't unlimited anymore
When Copilot launched in 2021 and Cursor followed in 2023, the marketing promise was simple: pay a flat monthly fee, get unlimited AI coding assistance. That model worked when the underlying inference was cheap and the average user fired a few hundred completions per day. By 2025 it had broken — agent mode and chat both let a single user generate thousands of premium-model calls per session, and the unit economics no longer worked at a $10-20 flat fee.
Both products responded the same way: keep the flat monthly fee, but redefine what 'unlimited' covers. Inline completions and the cheaper, faster models stayed unlimited. Premium-model requests — the ones that actually hit Claude Opus, GPT-5.5, or GPT-5.5-pro — got metered against a monthly credit quota. Once you blow through the quota, you're either downgraded to a slower model pool (Cursor's 'slow pool') or charged per-request overage (Copilot).
GitHub publishes the credit math explicitly: Pro gives you $15/mo in premium credits, Pro+ gives $70, Max gives $200. A premium-model request consumes between $0.04 and $0.12 of credit depending on the model and request size, which means a Pro user gets roughly 125-375 premium requests/month before going to overage billing. A Pro+ user gets ~580-1750. A Max user gets ~1660-5000.
Cursor's quota is less transparent — the 'fast pool' and 'slow pool' bands aren't published as dollar credits but as request-count buckets that vary by model. In practice, a Pro user gets ~500 fast-pool premium requests/month; past that, the same prompts route to the slow pool, which can take 30-90 seconds vs 2-5 seconds and may downgrade to a smaller model class. For most casual users it's invisible; for heavy users it bites by the third week of the month.
The practical implication for budgeting: do not budget by the sticker price. Estimate your daily premium-model request count (a heavy user typically runs 30-80/day, a light user 5-15/day) and back into which tier has enough headroom. A heavy user on Copilot Pro burns the $15 in roughly 7-10 days, then either upgrades to Pro+ or runs the rest of the month paying overage.