Anthropic Outage History

Every past Anthropic outage tracked by IsDown, with detection times, duration, and resolution details.

There were 637 Anthropic outages since March 2024. The 398 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Minor February 21, 2026

February 2026: Opus 4.6 elevated error rates

Detected Feb 21, 2026 5:16 PM EST · Resolved Feb 21, 2026 6:13 PM EST · Duration about 1 hour

Minor February 20, 2026

February 2026: Sonnet 4 errors

Detected Feb 20, 2026 2:42 PM EST · Resolved Feb 20, 2026 3:17 PM EST · Duration 35 minutes

Minor February 20, 2026

February 2026: Elevated errors on Claude Sonnet 4.5

Detected Feb 20, 2026 9:37 AM EST · Resolved Feb 20, 2026 10:38 AM EST · Duration about 1 hour

Major February 19, 2026

February 2026: Claude's responses not appearing in Cowork

Detected Feb 19, 2026 10:30 AM EST · Resolved Feb 19, 2026 11:14 AM EST · Duration 44 minutes

Major February 18, 2026

February 2026: Elevated error rates across multiple models

Detected Feb 18, 2026 10:35 AM EST · Resolved Feb 18, 2026 1:36 PM EST · Duration about 3 hours

Minor February 18, 2026

February 2026: Elevated errors on Claude Sonnet 4.6

Detected Feb 18, 2026 8:20 AM EST · Resolved Feb 18, 2026 10:35 AM EST · Duration about 2 hours

Minor February 18, 2026

February 2026: Elevated errors on Claude Opus 4.5

Detected Feb 18, 2026 5:49 AM EST · Resolved Feb 18, 2026 7:11 AM EST · Duration about 1 hour

Major February 17, 2026

February 2026: Cowork new task page not loading

Detected Feb 17, 2026 10:23 PM EST · Resolved Feb 17, 2026 11:10 PM EST · Duration about 1 hour

Minor February 17, 2026

February 2026: CSS errors on Claude.ai

Detected Feb 17, 2026 6:56 PM EST · Resolved Feb 17, 2026 7:12 PM EST · Duration 15 minutes

Minor February 17, 2026

February 2026: Intermittent errors in skills-related functionality

Detected Feb 17, 2026 3:15 PM EST · Resolved Feb 24, 2026 6:53 AM EST · Duration 7 days

Anthropic experienced intermittent high error rates in a skills-related service that affected claude.ai, Claude Desktop app, and the API over a period of approximately 6.6 days. The issue caused disruptions to skills-related functionality across these platforms. The problem was identified on February 22nd and fully resolved on February 24th, 2026.