GitHub is charging Copilot Business and Enterprise seats upfront and changed the code-review default.

From September 1, new signups reopen for card and PayPal customers with every seat assignment requiring payment before access; existing card/PayPal customers start incurring upfront per-seat charges October 1. Copilot code review's default effort moves from Lite to Balanced, so orgs wanting Lite must select it before September 28 or their premium request consumption changes. Seat prices are unchanged and revoking a seat still gives no prorated refund. Chat data retention also extends from 28 days to the life of the account on September 28. (GitHub Changelog)