Anthropic Outage History

Anthropic Claude services including Claude API (api.anthropic.com), claude.ai, Claude Code, and platform.claude.com experienced a brief period of degraded performance beginning at 7:23 AM UTC. The incident affected 4 components and could cause errors or slower responses for users interacting with Claude API, generating text, or accessing the Claude console. The provider indicated an investigation and worked to restore normal service, with the issue resolved by 9:33 AM UTC. The outage lasted approximately 2 hours and 10 minutes, and 2 status updates were issued during the incident. The services are now reported as fully operational.

Anthropic Claude experienced elevated error rates on Opus 4.5, impacting Claude API (api.anthropic.com), claude.ai, and Claude Code. Users could have encountered errors or degraded responses while using these components during the incident. The outage lasted about 35 minutes, with services returning to normal by Dec 21, 2025 1:58 PM UTC. The issue was identified and a fix was being implemented as of Dec 21, 2025 1:16 PM UTC.

Anthropic Claude experienced a brief partial outage affecting research access for some teams and organizations. Access to Claude.ai research features was unavailable for a subset of users per the status page. The incident began at 12:53 AM UTC and was resolved by 1:38 AM UTC, lasting about 45 minutes. The Claude status page issued two updates during the incident, signaling investigation and later restoration as access returned to normal.

Claude Code on Windows experienced an improper rendering issue that affected users relying on Claude Code for Windows workflows. The issue manifested as rendering problems within Claude Code on Windows, impacting the display of code and UI elements.

The incident began at Dec 19, 2025 8:33 PM UTC and was resolved by Dec 19, 2025 10:18 PM UTC, lasting 1 hour 45 minutes. The Claude Code component transitioned from up to warn and back to up, and the provider posted two official updates during the incident. The updates indicated that the issue had been identified and a fix was being implemented.

Anthropic's Sonnet 4.5 experienced elevated error rates starting at Dec 19, 2025 4:38 AM UTC, impacting platform.claude.com, Claude API, claude.ai, and Claude Code. Users reported slow responses and intermittent errors as the issue unfolded. The outage lasted about 3 hours and 15 minutes and was acknowledged with a status update, followed by a second update once services returned to normal. The Claude status page documented the investigation and restoration, with the incident resolved by Dec 19, 2025 7:53 AM UTC.

The Anthropic Claude service experienced degraded performance on Sonnet 4 with elevated error rates affecting free-tier claude.ai users. The incident began around 10:45 AM UTC, and the status page moved to a degraded state at 10:48 AM UTC. An update at 10:53 AM UTC noted the impact was limited to free-tier claude.ai users and that the Claude API (api.anthropic.com) was restored. By 11:23 AM UTC both claude.ai and the Claude API were back to normal. The provider issued three status updates during the incident, and two components were affected (Claude API and claude.ai) while Sonnet 4 was the affected feature during the degraded period.

Anthropic Claude experienced a brief degraded state when new chats started defaulting to Claude Opus. The issue was detected on 2025-12-16 and the claude.ai component entered a degraded state during the investigation. The incident began around 7:30 PM UTC and was resolved by 8:48 PM UTC, lasting about 1 hour and 18 minutes. The status page reported two updates during the incident, with claude.ai moving from up to warn and back to up.

Anthropic Claude.ai experienced a brief outage that prevented users from creating new conversations. The issue affected Claude.ai for about 10 minutes, beginning at 4:28 PM UTC and resolving by 4:38 PM UTC. During the incident, users could not start new chats while other Claude.ai features remained available. The Claude status page listed the incident as Investigating and posted two updates before service was restored.

Anthropic Claude experienced a service outage affecting four components: platform.claude.com, Claude API (api.anthropic.com), claude.ai, and Claude Code. Users reported elevated errors, timeouts, and unresponsiveness across models. The status page indicated an investigation began at Dec 14, 2025 9:31 PM UTC, the outage moved to down at Dec 14, 2025 9:33 PM UTC, and services were restored by Dec 14, 2025 10:53 PM UTC. The incident lasted roughly 1 hour and 20 minutes.

Anthropic Claude.ai experienced a degraded performance incident beginning around 7:48 PM UTC, with widespread reports of latency, API errors, and mobile/app connectivity issues affecting users relying on Claude.ai globally. The outage lasted roughly 28 hours and was resolved by 12:08 AM UTC.

Anthropic's Claude.ai status page documented an ongoing investigation as the cause, followed by restoration of normal service. The provider issued 2 official status updates during the incident, first noting the investigation and later confirming the issue was resolved.

User reports came from many regions including North America, Europe, Asia-Pacific, and Africa, indicating a global pattern of degraded performance across the Claude.ai service.