OpenAI's ChatGPT is experiencing a major partial outage as of April 20, 2026, with thousands of users worldwide unable to load the chatbot, Codex, and related APIs, prompting an ongoing investigation per the official status page. This follows a pattern of disruptions earlier this month, including FedRAMP workspace issues on April 15 and dictation errors on April 2, underscoring persistent scaling challenges for the large language model amid surging demand. Trader sentiment likely reflects OpenAI's infrastructure strains versus competitors like Anthropic's Claude, which boast higher uptime; watch for resolution updates and any post-incident postmortem, as prolonged downtime could signal deeper reliability risks ahead of peak usage periods.