OpenAI's robust infrastructure and rapid incident response have kept ChatGPT highly reliable throughout August 2026, with monitoring services reporting near-100% uptime for core large language model services despite isolated events. Short partial outages, such as the August 31 ChatGPT Work disruption lasting roughly five hours and similar degraded performance on August 27 and 21, affected specific features or subscription tiers but did not trigger widespread, full-day service failures. Traders view this track record of quick mitigations and high overall availability as evidence that meaningful outage days remain rare, producing overwhelming consensus around fewer than three such days. A prolonged core-platform incident spanning multiple calendar days or repeated major disruptions could still shift the market-implied odds.