Ask HN: Why were OpenAI, Claude, and Grok simultaneously down?

Sources: primary, same-day thread, same-day thread, same-day thread
Summary: The thread reached 378 points and 541 comments, opened while three providers were failing at once and before any vendor stated a cause. Four separate front-page outage submissions ran the same day for ChatGPT, Claude, Grok and Codex.
Comments: HN commenters treated shared compute leasing as the likeliest explanation rather than coincidence, and the thread records how little cross-provider dependency is publicly documented.
Why it matters: The thread is the available record of how operators reasoned about correlated model-provider failure while the status pages were still investigating.