Anthropic's Claude services have faced repeated infrastructure strain throughout 2026, with capacity constraints and elevated error rates driving frequent partial outages across claude.ai, the API, Claude Code, and Cowork. August alone recorded at least 13 days with documented incidents—including a multi-hour 529 overload on August 24 affecting models like Opus 5, Mythos 5, and Fable 5—reflecting demand growth outpacing available compute despite partnerships with Amazon and Google. This pattern of multiple short-to-moderate disruptions per month, rather than isolated events, underpins trader consensus around 8–13 days of downtime in September, as the company continues scaling newer models without fully resolving peak-load vulnerabilities. Upcoming factors include any post-summer demand spikes or further model releases that could extend the instability.