A major Claude outage disrupted several Anthropic services on August 16, 2026. Users reported login failures, loading errors and requests that did not complete on Claude.ai, Claude Code and Claude Cowork.
The incident began at about 21:58 UTC. Anthropic first identified an authentication problem affecting some users, then confirmed a wider disruption involving degraded performance across its services.
By 22:40 UTC, Anthropic said it had restored all affected services.
Authentication problems hit several Claude services
Anthropic initially said it was investigating an issue that stopped some users from signing in to Claude.ai, Claude Code and Claude Cowork.
Users could encounter failed login attempts, pages that would not load and errors when submitting requests. For people already signed in, the disruption could also cause slower performance or incomplete responses.
Soon after the first update, Anthropic reported a broader performance issue. The company said the incident affected Claude.ai and platform.claude.com, while its teams continued to investigate the cause.
Anthropic classifies incident as a major outage
During the disruption, Anthropic classified Claude.ai, Claude Code and Claude Cowork as experiencing a major outage.
Claude Console and the Claude API remained operational throughout the incident. This meant some developers and businesses could continue using API-based workflows even while consumer-facing and coding-focused Claude services faced problems.
Anthropic did not share the cause of the Claude outage while the investigation remained active.
Services restored later the same evening
Anthropic posted its first notice at 21:58 UTC. At 22:07 UTC, the company confirmed degraded performance affecting Claude.ai and platform.claude.com.
The company then continued investigating and working to restore normal service. At 22:40 UTC, Anthropic announced that all services had recovered.
The outage lasted less than an hour based on the company’s published updates. However, the incident affected several key services at once, including Claude.ai, Claude Code and Claude Cowork.
Conclusion
The Claude outage caused widespread access and performance problems across several Anthropic services. Although the company restored service within the hour, it had not disclosed the underlying cause at the time of the final update.
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