Anthropic incident: Degraded performance for Claude Opus 5, Claude Sonnet 5

Affected components

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

1. resolvedAug 17, 2026, 15:29 UTC

   This incident has been resolved.

2. monitoringAug 17, 2026, 14:39 UTC

   A fix has been implemented and we are monitoring the results.

3. investigatingAug 17, 2026, 14:25 UTC

   Claude Opus 5 is operational. Claude Sonnet 5 is degraded. We are investigating.

4. investigatingAug 17, 2026, 13:56 UTC

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

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Anthropic's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

• GitHub: Incident with GitHub.comCritical · Aug 17, 2026, 13:40 UTC
• Elasticsearch: Elasticsearch 9.5.1: false-positive matches in certain boolean queriesMajor · Aug 14, 2026, 09:22 UTC
• CircleCI: GitHub Incidents impacting CircleCI functionalityMajor · Aug 17, 2026, 14:04 UTC
• Cursor: GitHub degradation affecting some Cursor services — Automations, Cloud Agents, CodebaseMajor · Aug 17, 2026, 14:34 UTC
• dbt Cloud: Git Failures in dbt PlatformMajor · Aug 17, 2026, 15:02 UTC
• Akamai: Connection drops and increased latency in MiamiMinor · Aug 13, 2026, 19:31 UTC
• Supabase: 401 errors due to JWT rejectionsMinor · Aug 14, 2026, 02:23 UTC
• HashiCorp Vault: Delayed HCP Terraform RunsMinor · Aug 15, 2026, 17:08 UTC
• LaunchDarkly: Flag Updates via Polling API delayedMinor · Aug 17, 2026, 10:36 UTC
• GitBook: GitHub outage affecting Git SyncMinor · Aug 17, 2026, 13:56 UTC

How often does Anthropic have incidents?

Anthropic reported 47 incidents in the last 90 days, 21 of them major or critical. A typical incident lasted 1h 4m. See Anthropic's uptime and incident history