Anthropic incident: Degraded performance for Claude Fable 5

Affected components

• Claude API (api.anthropic.com)
• Claude Code
• Claude Cowork
• claude.ai

1. resolvedOct 21, 2026, 20:29 UTC

   The issue affecting other Claude models has been resolved.

2. investigatingOct 21, 2026, 19:49 UTC

   We are investigating elevated errors on requests to Claude Fable 5. We will provide an update as soon as possible.

What APIStatus.watch saw

• Oct 21, 2026, 19:50 UTCoperational → degraded
• Oct 21, 2026, 20:30 UTCdegraded → operational

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

• Snowflake: INC20000301Critical · Oct 21, 2026, 18:26 UTC
• Telnyx: Wireless connectivity disruptionsMajor · Oct 21, 2026, 19:04 UTC
• Cloudflare: Elevated Errors for R2 and Durable Objects in ENAMMajor · Oct 21, 2026, 19:15 UTC
• Shopify: Some merchants encountering error messages when trying to login to their adminsMinor · Oct 8, 2026, 14:49 UTC
• Twilio: SMS Delivery Delays and Failures from a Subset of Twilio Alphanumeric Sender IDs to Mobile ChinaMinor · Oct 9, 2026, 06:42 UTC
• Twilio: Voice Call Post Dial Delay from a Subset of Twilio Phone Numbers to ThailandMinor · Oct 12, 2026, 11:53 UTC
• Twilio: Voice Call Failures and Post Dial Delay from a Subset of Twilio Mobile Numbers to BrazilMinor · Oct 19, 2026, 13:29 UTC
• Twilio: SMS Delivery Delays and Failures Between a Subset of Twilio Long Codes and Multiple Networks in ItalyMinor · Oct 19, 2026, 16:53 UTC
• Twilio: Voice Call Post Dial Delay from a Subset of Twilio Phone Numbers to IsraelMinor · Oct 21, 2026, 03:10 UTC
• Twilio: SMS Delivery Delays from Twilio to Orange FranceMinor · Oct 21, 2026, 10:23 UTC

How often does Anthropic have incidents?

Anthropic reported 53 incidents in the last 90 days, 25 of them major or critical. A typical incident lasted 1h 4m. See Anthropic's uptime and incident history