Anthropic AI Models Outage: Claude Mythos, Fable, and Opus Disrupted
Photo: BleepingComputer
Quick answer
On September 3, 2026, Anthropic experienced a widespread outage affecting its AI models, including Claude Mythos, Fable, and Opus.
Anthropic has confirmed a major outage affecting its AI models. The incident began on September 3, 2026, around 16:41 Moscow time, impacting several versions of Claude, including Mythos 5.1, Fable 5.1, and Opus 5.
Users report an increased number of errors when submitting requests to the models. Some queries fail or return errors. Earlier versions of Opus, including 4.8 and 4.6, are also affected.
Anthropic’s official status page indicates that engineers have identified the cause and are working to resolve it. However, as of publication, the outage persists, preventing users from fully utilizing the affected models.
Common questions
- Which Claude models are affected by the outage?
- The outage impacts Mythos 5.1, Fable 5.1, Opus 5, as well as earlier versions Opus 4.8 and 4.6. Users are reporting errors when interacting with these models.
- When did the Claude outage begin?
- The incident started on September 3, 2026, around 16:41 Moscow time. As of publication, the issue remains unresolved.
- What is Anthropic doing to fix the outage?
- The company has identified the root cause and is actively working to resolve it. Updates are being posted on the official status page.
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