Your plan
Your usage
Bill shock table — same request count, different multiplier
This is the exact mechanism behind reported jumps like $29→$750 and $50→$3,000: the raw request count barely moved, but routing those requests to a higher-multiplier model didn't.
| Multiplier | Effective units | Over allowance | Total / mo |
|---|
Why "premium requests" isn't the same as "how much you'll pay"
GitHub Copilot's pricing looks simple on the surface — Free, Pro $10, Pro+ $39, Business $19/seat, Enterprise $39/seat — but the number that actually determines your bill is a second, hidden variable: the model multiplier. Base-tier models are unlimited and cost nothing against your allowance. Everything else — GPT-5-class, Claude, Gemini, and especially top-tier reasoning models — consumes your monthly premium-request allowance at a rate that can be 3x, 6x, 10x, or in 2026's legacy-annual-plan multiplier hike, as high as 27x a single raw request. A developer who thinks they're making "600 requests a month" against a 300-request Pro allowance might actually be burning 1,800 to 16,200 allowance units depending entirely on which model agent mode is routing to.
As of June 1, 2026, GitHub finished moving premium requests onto usage-based AI Credits: your included allowance is still free, but anything beyond it bills at roughly $0.04 per effective unit — if you've opted in. The default spending budget for overage is $0, meaning by default you simply stop being able to make premium requests once you hit your allowance rather than getting billed. The bill-shock stories from 2026 — $29 to $750, $50 to $3,000 — all involve developers who explicitly opted into overage billing and were running heavy agent-mode workloads through high-multiplier models without watching the multiplier.
The practical lever isn't reducing how often you use Copilot — it's which model agent mode defaults to. Routing routine completions and simple agent tasks to a 1x-3x model and reserving the highest multiplier tiers for genuinely hard problems can cut effective allowance consumption by an order of magnitude for the same amount of actual work done.