Anthropic's generative AI service Claude suffered elevated error rates on June 23, 2026, across its web app, API and coding tools, with tens of thousands of users believed to have been affected.
June 23, 2026 · Anthropic
Claude Goes Down Twice in One Day as Demand Outpaces Infrastructure
Two separate outages hit claude.ai, the API, Claude Code, Cowork and the Console — flooding users with "529 Overloaded" errors. It's the latest in a string of disruptions as 2026 usage surges past what Anthropic's servers can handle.
2
separate outages in a single day
529
"Overloaded" error users mainly reported
10
disruptions in 12 days, per the June 16 count
Duration of the two June 23 incidents
The morning Opus 4.8 outage lasted far longer
Opus 4.8 errors~06:28–08:45 UTC
Multi-model errors14:08–15:33 UTC
The strain
Work halted and deadlines slipped for developers, agentic workflows and enterprise API users — recurring disruptions on March 2, June 2, 5 and 16 expose infrastructure growing slower than demand.
The upside
Recovery was relatively quick and status updates stayed transparent. Suggested fixes: fallbacks, retries with exponential backoff, and diversifying providers to avoid single-vendor dependence.
"AI as infrastructure" is only as reliable as its servers.
As companies embed Claude deeper into their workflows, the risk of single-provider dependence is back in debate. How Anthropic scales to meet surging demand will decide its future reliability. Claude for Government, on separate infrastructure, stayed online.
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