Claude Status: Multiple Models Hit by Degraded Performance
Degraded performance for multiple models
Anthropic's status page reports degraded performance affecting several Claude models, including Claude Mythos 5, Claude Fable 5, Claude Opus 5, Claude Sonnet 5, and Claude Haiku 4.5. The issue impacts claude.ai, the Claude API, Claude Code, and Claude Cowork. The incident began on August 18, 2026, and is currently under investigation, with updates promised as soon as possible.
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Haiku 4.5, and other Claude models.