Anthropic reports multiple service issues

Anthropic is dealing with 2 concurrent service issues — tracked live below.

By The Downtime · Aug 13, 2026 · 2:45 PM ·Updated 1 week ago

Anthropic is investigating elevated error rates affecting requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. The company has classified the incident as major impact and is currently in the investigating phase.

Anthropic develops Claude, an AI assistant used by developers and enterprises for a range of applications through APIs and direct interfaces.

The investigation began following detection of the elevated errors. No additional details about the scope or duration of the issue have been provided.

This is a developing story. We will update as Anthropic releases more information.

⚠️ Issues being tracked (2)

Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5

Resolved

source ↗

Degraded performance for multiple models

Resolved

source ↗

🕒 Live updates (7)

resolved Elevated errors for Claude Mythos 5, Cla... Aug 13, 4:08 PM

The issue affecting Claude Mythos 5 and Claude Fable 5 has been resolved.

investigating Elevated errors for Claude Mythos 5, Cla... Aug 13, 3:44 PM

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

investigating Elevated errors for Claude Mythos 5, Cla... Aug 13, 2:33 PM

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

resolved Degraded performance for multiple models Aug 12, 6:07 PM

This issue has been resolved.

identified Degraded performance for multiple models Aug 12, 5:28 PM

We are continuing to work to resolve an issue resulting in slightly elevated errors on requests to Claude Fable 5. We will provide an update as soon as possible.

identified Degraded performance for multiple models Aug 12, 4:10 PM

We have identified an issue which resulted in errors across multiple models. At this time, errors are primarily impacting Claude Fable 5 and we are working to fully resolve these issues.

investigating Degraded performance for multiple models Aug 12, 1:50 PM

We are investigating elevated errors on requests to multiple models. We will provide an update as soon as possible.

📎 Sources

Anthropic status ↗

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.