CyberNew CyberNew
Threat Intelligence & APT BleepingComputer 1 month ago

Anthropic confirms Claude is down, multiple models affected

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CyberNew Threat Research Desk
• Original Reporting: BleepingComputer
CyberNew Threat Intel Assessment
Assessed Severity: INFORMATIONAL
Impacted Surface
Enterprise Perimeter & Network Defense
Intelligence Sector
Threat Intelligence & APT

Analyst Takeaway

"Claude is experiencing an outage, with users encountering elevated errors when sending requests to multiple Anthropic AI models. The incident began on September 3, 2026, at around 9:41 AM ET, and is affecting several Claude models, including the company's latest Mythos, Fable, and Opus models. According to Anthropic’s status page , the company initially said it was investigating elevated errors..."

Recommended Defense & Mitigation

  • Threat Monitoring: Ingest published IOCs into SIEM/EDR detection rules for continuous telemetry monitoring.
  • Security Awareness: Alert staff and maintain baseline endpoint hardening across endpoints.
Curated & Verified by CyberNew Threat Intelligence Desk Standard Defense Framework (NIST / MITRE ATT&CK)

claude down

Claude is experiencing an outage, with users encountering elevated errors when sending requests to multiple Anthropic AI models.

The incident began on September 3, 2026, at around 9:41 AM ET, and is affecting several Claude models, including the company's latest Mythos, Fable, and Opus models.

According to Anthropic’s status page, the company initially said it was investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5.

At around 9:41 AM ET, Anthropic said it had identified the cause of the elevated errors and was working on a fix.

Claude error when using affected models
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Source Verification & Original Intelligence

This threat report was reviewed by CyberNew analysts and cross-referenced with primary security disclosures from BleepingComputer.

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