Anthropic Outage History

From Aug 25, 2025 5:30 PM UTC to Aug 28, 2025 2:00 AM UTC, Claude Opus 4.1 experienced degraded quality for some requests. Users may have seen lower intelligence, malformed responses, or issues with tool calling in Claude Code. The degradation was tied to a rollout of the inference stack and affected Claude Code, console.anthropic.com, claude.ai, and api.anthropic.com. The rollout has since been rolled back for Claude Opus 4.1.

On Aug 29, 2025 5:03 PM UTC the status page moved to warn as the issue persisted. A rollback of the inference stack was performed, and affected components were gradually restored. The status returned to up by Aug 30, 2025 2:13 AM UTC. The provider issued 2 status updates during the incident. A small number of user reports were observed during the incident.

Anthropic Claude Sonnet 4.0 experienced elevated errors affecting several Claude services. Users attempting to use Claude Sonnet 4.0 features may have hit errors or degraded performance when using Claude Code, the web console at console.anthropic.com, claude.ai, or the API at api.anthropic.com. The issue began at 5:30 AM UTC (22:30 PT) and prompted an investigation; the status page later updated to indicate ongoing degraded performance and then recovery.

The provider issued 2 status updates during the incident and the services returned to normal by 9:28 AM UTC. The outage lasted roughly 3 hours and 58 minutes.

The incident affected Claude.ai on desktop, with MCP tool calls failing and causing degraded performance for desktop users. The issue began around 6:47 PM UTC and the Claude status page indicated a degraded state for claude.ai starting at 6:48 PM UTC. The problem appeared isolated to desktop MCP tooling and did not indicate a broader outage across Claude services. The service was restored after a brief outage, with two official status updates issued during the incident and the component returning to normal by 7:33 PM UTC.

Anthropic's Claude Opus 4.1 experienced elevated errors across multiple Claude services, including Claude Code, console.anthropic.com, claude.ai, and api.anthropic.com. The incident began at Aug 28, 2025 12:33 PM UTC with the status page indicating degraded performance and an investigation. Errors returned toward baseline by Aug 28, 2025 1:05 PM UTC as engineers worked to identify the cause. Users may have seen intermittent failures and higher error rates during this period.

Recovery was reported by Aug 28, 2025 3:08 PM UTC with all four components restored to normal operation. The outage lasted about 2 hours and 35 minutes, and the provider issued 2 status updates during the incident.

Anthropic Claude Opus 4.1 experienced elevated errors across multiple endpoints, impacting four Claude components: console.anthropic.com, Claude Code, claude.ai, and api.anthropic.com. Users attempting requests reported failures and degraded responses starting at 6:10 AM UTC, with the issue first listed as elevated at 6:33 AM UTC. The incident lasted approximately 5 hours and 13 minutes and was resolved by 11:23 AM UTC.

The Claude status page published 2 updates during the event, and a small number of user reports were observed, indicating limited impact. Services returned to normal after the final update, with no ongoing issues reported.

Anthropic Claude Opus 4.1 experienced elevated errors and degraded performance across core Claude services, including the Claude API, Claude Code, Claude AI, and the Claude Console. The Claude status page moved to a warning at Aug 27, 2025 11:33 AM UTC as engineers investigated an issue that began around 11:14 AM UTC. The outage lasted about 2 hours and 25 minutes and was resolved by Aug 27, 2025 1:58 PM UTC. The incident prompted two official status updates during its course.

Two status updates were published: one announcing the investigation and elevated errors, and a follow-up confirming restoration. The issue affected four core components: console.anthropic.com, Claude Code, claude.ai, and api.anthropic.com, indicating a platform-wide degraded experience for users.

Anthropic Claude Opus 4.1 experienced elevated errors beginning at 6:08 AM UTC, prompting an investigation. The incident affected four components: claude.ai, console.anthropic.com, api.anthropic.com, and Claude Code, likely causing errors for users attempting to use Claude Opus 4.1 features. A warn status was issued at Aug 27, 2025 6:23 AM UTC as the team worked to identify and remediate the issue. The problem was resolved and the status returned to normal by Aug 27, 2025 8:13 AM UTC after two official updates describing the investigation and restoration.

Anthropic Claude Opus 4.0 briefly experienced elevated errors, causing a short degradation in service for claude.ai and api.anthropic.com. The Claude status page indicated elevated errors and ongoing investigation starting at 3:03 PM UTC, and the service returned to normal by 3:08 PM UTC after about 5 minutes. The incident included two official status updates during its duration.

Anthropic Claude.ai experienced a brief degraded service caused by a connectivity issue with MCP servers. This prevented downgrading MCP connections to SSE for a limited number of MCP servers, leading to intermittent access problems for Claude.ai users. The claude.ai component was affected, and StatusGator noted the issue and recovery through the provider's updates. The outage began at Aug 25, 2025 7:03 PM UTC and was resolved by Aug 25, 2025 8:43 PM UTC, lasting roughly 1 hour and 40 minutes. Two status updates were published during the incident.

Anthropic Claude Sonnet 4 and related services (Claude Code, claude.ai, console.anthropic.com, api.anthropic.com) experienced elevated errors beginning at 7:23 AM UTC and lasting about 2 hours. The status page noted an investigation started around 7:20 AM UTC, with affected components returning to normal by 9:23 AM UTC.

Two official status updates were posted during the incident: the initial note of elevated errors and degradation, followed by restoration of all affected components. Affected components included Claude Code, claude.ai, console.anthropic.com, and api.anthropic.com.