When were the outages reported?

Claude and Grok reported issues starting around 10:30 PM on September 3, while ChatGPT reported issues shortly before midnight on September 4.

Have all services been restored?

Yes. Claude was restored at 1:16 AM, ChatGPT at 1:55 AM, and Grok at 2:07 AM on September 4.

Did the outage affect any specific features?

OpenAI mentioned that some Codex users may need to re-pair their mobile devices after restoration.

Large Language ModelsAI Business & IndustryITmedia AI＋43m agoSep 4, 2026, 04:01 JST1 min read

ChatGPT, Claude, Grok outages resolved

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Key takeaway

Multiple AI services, including ChatGPT, Claude, and Grok, experienced outages on September 4.
All have been restored.
The cause remains unknown.

3 Key Points

What happened
On September 4, 2026, multiple AI services experienced outages. ChatGPT, Claude, and Grok were affected, with connection issues reported from around 10:30 PM on September 3 for Claude and Grok, and shortly before midnight for ChatGPT.
Why it matters
The outages disrupted access to major AI tools used by businesses and individuals. All three services have since been restored, with Claude recovering at 1:16 AM, ChatGPT at 1:55 AM, and Grok at 2:07 AM, according to their respective status updates.
What to watch
OpenAI noted that some Codex users may need to re-pair their mobile devices after the ChatGPT outage. The cause of the outages remains unknown.

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Context & Analysis

The simultaneous outages across three major AI platforms highlight the reliance on these services and the potential for widespread disruption when they falter. While the cause remains undetermined, the quick recovery suggests robust monitoring and incident response procedures. This incident may prompt businesses to consider contingency plans for AI tool downtime, though no major impacts have been reported.

FAQ

When were the outages reported?: Claude and Grok reported issues starting around 10:30 PM on September 3, while ChatGPT reported issues shortly before midnight on September 4.
Have all services been restored?: Yes. Claude was restored at 1:16 AM, ChatGPT at 1:55 AM, and Grok at 2:07 AM on September 4.
Did the outage affect any specific features?: OpenAI mentioned that some Codex users may need to re-pair their mobile devices after restoration.

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