Three generic AI chatbot windows displaying temporary service error messages side by side.

Did ChatGPT, Claude and Grok suffer overlapping outages on September 3?

Published Sep 4, 2026

Verdict

True

Verification confidenceHigh

Explanation

Yes. Official status records and contemporaneous reporting show that ChatGPT, Claude and Grok all experienced service problems during overlapping periods on September 3.

OpenAI logged elevated errors affecting ChatGPT from 14:43 to 16:55 UTC. Anthropic recorded Claude model errors from 13:26 to 16:16 UTC, while The Verge reported that Grok’s outage began around 13:30 UTC. Those windows overlapped.

The overlap does not prove a common cause or a total shutdown for every user. The official records describe degraded performance or model-specific failures, and all three services were later reported as restored.

Key takeaway

The three AI services did have overlapping disruptions. Available evidence does not show that one shared failure caused them.

Evidence

OpenAI recorded elevated ChatGPT errors

OpenAI

Supports the claim

OpenAI’s status record shows a ChatGPT incident investigated from 14:43 UTC and resolved at 16:55 UTC on September 3.

Based on: OpenAI

Anthropic recorded Claude model errors

Anthropic

Supports the claim

Anthropic’s incident record shows elevated errors beginning at 13:26 UTC and ending at 16:16 UTC across several Claude products and models.

Based on: Anthropic

Independent reporting confirms Grok’s overlapping outage

The Verge

Supports the claim

The Verge reports that Grok began experiencing an outage around 13:30 UTC, overlapping the official OpenAI and Anthropic incident windows, while noting that no common cause was established.

Based on: The Verge