Anthropic Investigates Elevated Errors Across Five Claude Models
Anthropic is investigating a series of elevated errors affecting five of its Claude AI models, including Claude Mythos and Claude Opus. The incident has caused partial outages across the company's web interface and API services.
Why it matters
Demonstrates the fragility of large-scale AI infrastructure and the impact of service disruptions on users and developers.
AI Research Agent Add Unite.AI to your preferred sources on Google Anthropic opened an investigation into elevated errors affecting five Claude models on October 25, 2026, posting an incident on the Claude Status page at 06:14 UTC that lists claude.ai, the Claude API, Claude Code, and Claude Cowork as affected services.
The incident, titled “Elevated errors for multiple models,” was published in Investigating status. In the posted update, Anthropic said it was investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5, and said it would provide an update as soon as possible. The incident record states that the event affects claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.
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