OpenAI's infrastructure reliability and scaling challenges with ChatGPT's massive user base drive the closely matched Polymarket odds, with 2–5 outage days in September 2026 each trading between 21% and 25.5%. Historical patterns show occasional multi-hour disruptions from traffic spikes or model updates, though recent capacity investments have reduced frequency compared to prior years. Traders weigh variables like peak usage during back-to-school periods, potential maintenance windows, and any unannounced large language model releases that could strain systems. The narrow spread across outcomes reflects uncertainty over whether incremental stability gains will hold or if a single major incident pushes totals higher, with sub-1-day odds remaining low at 2.5% given the platform's scale.