Anthropic Outage History

Anthropic Claude Opus 4.5 experienced elevated errors that impacted three components: Claude API (api.anthropic.com), claude.ai, and Claude Code. Users encountered failed requests and degraded responses starting at Nov 25, 2025 8:58 PM UTC and continuing through Nov 25, 2025 11:48 PM UTC, for a duration of about 2 hours and 50 minutes. The incident reflects a partial outage rather than a full service loss, with users across regions affected by the degraded functionality.

Anthropic's Claude API (api.anthropic.com) experienced elevated error rates, causing degraded performance and intermittent failures for users calling the API. User reports began around 8:45 AM UTC and preceded official acknowledgment. The Claude API was marked as degraded with an investigation at 9:38 AM UTC and the issue persisted until 10:43 AM UTC when service returned to normal. The incident affected a single component and involved two status updates during its course.

On 8:45 AM UTC, users across Mansfield, UK; Hyderabad, India; and Singapore began reporting 500 internal server errors from the Claude API. The outage caused brief interruptions for API calls, lasting about 1 minute from Nov 25, 2025 8:57 AM UTC to Nov 25, 2025 8:58 AM UTC. The incident appears to be globally distributed but very short in duration, with only a brief window of impact.

StatusGator detected an Early Warning Signal at Nov 25, 2025 8:57 AM UTC ahead of any official Claude status update. No Claude status page updates were published during the incident, and the disruption was resolved quickly, suggesting a transient backend issue affecting the Claude API.

Anthropic's Claude API, claude.ai, and Claude Code experienced a usage attribution issue that caused some Sonnet model usage to be counted as Opus usage. This could lead to billing or quota confusion for affected users. The incident began at Nov 24, 2025 6:18 PM UTC and was resolved by Nov 24, 2025 7:48 PM UTC, lasting about 1 hour and 30 minutes. A small volume of user reports around 7:00 PM UTC described discrepancies in usage counts. The incident affected 3 components across Claude API, claude.ai, and Claude Code.

During the incident, the Claude status page posted updates indicating the issue in the message “Model usage attribution issues” and noted ongoing investigation. The second update at Nov 24, 2025 7:48 PM UTC announced resolution as services returned to normal across the three components.

The Anthropic Claude Code API experienced a global outage with 500 errors and timeouts affecting developers and applications relying on Claude Code. The incident began at Nov 24, 2025 3:35 PM UTC and was resolved by Nov 24, 2025 4:36 PM UTC, lasting about 1 hour and 1 minute. Users reported internal server errors and timeouts across multiple regions, indicating a broad impact on Claude Code functionality.

Claude's official status page did not publish an incident update during the window. StatusGator detected the issue at Nov 24, 2025 3:35 PM UTC, highlighting early visibility before widespread user reports. A notable volume of user reports described 500 errors and timeouts through the late afternoon UTC, with activity peaking around 16:15–16:30 UTC before the service stabilized by Nov 24, 2025 4:36 PM UTC.

Anthropic Claude API (api.anthropic.com) experienced elevated error rates beginning at 1:08 PM UTC, resulting in failed or slow API calls for a subset of users. Users reported authentication failures such as invalid OAuth tokens, indicating issues with token validation and request processing.

The Claude status page documented a degraded condition as the incident unfolded, and two official updates were issued during the outage. The service returned to normal after 2:13 PM UTC, with the outage lasting about 1 hour and 5 minutes.

Anthropic Claude experienced elevated errors starting at 8:13 AM UTC UTC, impacting four Claude services: platform.claude.com, Claude API (api.anthropic.com), claude.ai, and Claude Code. Users worldwide reported slow responses, chats not sending messages, and intermittent unavailability, signaling a partial outage across core components.

Anthropic experienced a brief degraded performance across Claude 4 Sonnet and related components. At Nov 19, 2025 5:23 AM UTC, the Claude status page showed an increased error rate affecting 4 components: platform.claude.com, Claude Code, Claude API, and claude.ai. The page noted that the issue had been identified and a fix was being implemented. The incident lasted about 5 minutes, with services restored by Nov 19, 2025 5:28 AM UTC after the fix took effect. The provider issued two status updates during the event, transparently communicating the issue and its resolution.

The Claude.ai service experienced a global outage beginning at Nov 18, 2025 12:09 PM UTC, with an initial note of investigation recorded at Nov 18, 2025 12:03 PM UTC. The outage affected claude.ai across web and mobile clients, causing login failures, errors when loading chats, and inability to access Claude.ai features. The disruption persisted for about 3 hours and 14 minutes and was resolved by Nov 18, 2025 3:23 PM UTC.

Anthropic Claude Code experienced degraded performance with elevated error rates, causing frequent API 500 errors for users worldwide. The Claude Code component was affected, with issues reported across multiple regions. The incident began at Nov 18, 2025 8:58 AM UTC and lasted about 55 minutes, with service restored by Nov 18, 2025 9:53 AM UTC. The provider issued 2 status updates during the incident.

Users across Europe, North America, Asia-Pacific, and other regions reported issues as the incident unfolded, indicating widespread impact across services relying on Claude Code. The Claude team investigated and implemented remediation leading to recovery, with status page updates confirming the resolution.