OpenAI change history: Elevated errors affecting ChatGPT

OpenAI reported a major ChatGPT incident affecting conversation loading and continuation, Voice, and Work Mode. It started at 2026-07-19 14:49 UTC and resolved at 2026-07-19 17:05 UTC, lasting 2 h 15 min. OpenAI applied a mitigation and confirmed full recovery; the specific cause was not disclosed.