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Anthropic Investigating Elevated Errors on Claude Sonnet 5

The AI company is working to resolve a major issue affecting its Claude Sonnet 5 model.

By The Downtime · Sep 3, 2026 · 12:45 PM ·Updated 5 days ago

Anthropic is investigating elevated error rates impacting requests to Claude Sonnet 5, according to the company's status page. The incident is classified as major and remains under investigation.

Anthropic develops Claude, an AI assistant used by developers, enterprises, and end users through web and API interfaces.

The company posted an initial alert stating it is investigating elevated errors on Claude Sonnet 5 requests and committed to providing updates as the situation develops.

This is a developing story. The Downtime will continue monitoring for updates.

🕒 Live updates (3)

resolved Sep 3, 12:56 PM

This incident has been resolved.

monitoring Sep 3, 12:47 PM

A fix has been implemented and we are monitoring the results.

investigating Sep 3, 12:37 PM

We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.

📎 Sources

Outage details are aggregated from official provider status pages. The Downtime reports them as a public service and is not affiliated with the providers named.

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