Claude and ChatGPT go down simultaneously, ChatGPT web returning 404 errors
TechnicalTantrum · reddit · 2026-09-03
A Reddit user reports that Claude and ChatGPT went down at roughly the same time: ChatGPT's web interface is returning 404 errors and Claude Design is unusable. The poster speculates this could escalate into another major outage. This is a first-hand user-side report; no official cause or ETA has been given.
Related event: ChatGPT, Claude and Grok suffer rare simultaneous outage(72 posts)→
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