OpenAI is converting fixed daily spending limits in ChatGPT Ads Manager into seven-day averages, a change applied to running campaigns without advertiser action and without a published single-day overspend ceiling. The switch was flagged in a weekly product update email to beta advertisers, reported on July 24, 2026, as arriving the following week. The note listed eight changes: conversion-optimized bidding, geographic exclusions, mobile measurement integrations, a bulk API, hashed-data conversion matching, automatic intraday pacing, a redesigned product card, and the removal of the daily budget cap, introduced nine weeks earlier. According to OpenAI, "Daily budgets will change from fixed daily limits to average daily budgets: the average you want to spend per day over seven days," adding "No action is required, and your total budget is not changing." Spend "may vary by day while staying within daily and seven-day limits." The change lacks an opt-in mechanism, and the seven-day window is shorter than monthly reconciliation periods used by larger platforms. The daily limit is asserted but never quantified. A second item states, "Daily budgets now pace automatically throughout the day, helping distribute spend more evenly." ChatGPT Ads Manager first gained daily budgets on May 22, 2026.