Outage recap · xAI

Grok outage — September 21, 2026

On September 21, 2026, Grok had a reported incident on xAI's official status page. Below is what was reported — impact, timing, and the AI services the same upstream outage could affect.

Outages across API, Grok.com, and Grok Build

critical
Started
Sep 21, 9:02 PM EDT
Resolved
Sep 21, 9:28 PM EDT
Duration
26 min

xAI's updates (3)

  1. investigating · Sep 21, 9:03 PM EDT

    We are investigating a datacenter issue

  2. investigating · Sep 21, 9:20 PM EDT

    Traffic has almost fully recovered, seeing slight hiccups

  3. resolved · Sep 21, 9:28 PM EDT

    This incident has been resolved. All services are operating normally.

What our checks recorded

We checked Grok 5 times from xAI's start time to its resolution, once every five minutes. Every one of them reached Grok's site, so this incident did not show up as a failed page load. Our check loads the public site; it cannot see an API error or a broken feature. Median response time was 195 ms, against 196 ms over the 24 hours before. xAI posted the incident at Sep 21, 9:02 PM EDT.

Updates are xAI's own words from its status page (status: resolved); we never add an inferred cause.

The AI cascade

Grok depends on xAI. When that upstream has an incident, it doesn't hit Grok alone — these AI tools share the dependency and can degrade at the same time:

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Is Grok down right now? →Grok status history →

AIDownCheck is not affiliated with xAI. This recap summarizes incidents published on xAI's official status page.