Claude hit by worldwide outage as Anthropic confirms '529 Overloaded' errors

The failure surfaced as a 529 status — the code Anthropic's API returns when its servers cannot absorb current request volume — rather than as a hard 5xx, so callers saw "API Error: 529 Overloaded. This is a server-side issue, usually temporary — try again in a moment." Anthropic began investigating at 7:49 p.m. UTC and reported the issue identified at 8:33 p.m. UTC, then posted recovery across most models at 5:30 p.m. EDT and full resolution at 7:00 p.m. EDT. It has not published a root cause.

The blast radius is the story. Because the outage sat at the API layer, it took down not just Claude's own apps but the growing tier of coding assistants, agent frameworks and automation pipelines that call Anthropic as a single upstream dependency — the kind of concentration risk that only becomes visible on days like this. What to watch: whether Anthropic publishes a postmortem, and whether the incident pushes more teams toward multi-provider routing.