Claude (Anthropic) · 56d ago
Degraded performance for multiple models
ResolvedYes — Claude had a problem on August 18, 2026, and Claude (Anthropic) has since marked it resolved. Claude (Anthropic)'s latest word: “The issue affecting Claude Opus 5 has been resolved. Impact occurred from 16:11 to 18:23 UTC.”
Timeline
Started: 8/18/2026, 4:20:22 PM
Last update: 8/18/2026, 7:01:45 PM
Resolved: 8/18/2026, 7:01:45 PM
Affected: rwppv331jlwc, k8w3r06qmzrp, yyzkbfz2thpt, bpp5gb3hpjcl
Updates
resolved
The issue affecting Claude Opus 5 has been resolved. Impact occurred from 16:11 to 18:23 UTC.
8/18/2026, 7:01:45 PM
monitoring
A fix has been implemented and we are monitoring the results.
8/18/2026, 6:26:31 PM
investigating
We are investigating elevated errors on requests to Claude Opus 5. We will provide an update as soon as possible.
8/18/2026, 5:12:22 PM
investigating
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Haiku 4.5, and other Claude models. We will provide an update as soon as possible.
8/18/2026, 4:20:49 PM
investigating
We are investigating reports of degraded performance affecting multiple models. We will provide an update as soon as possible.
8/18/2026, 4:20:22 PM
More Claude (Anthropic) incidents
- Elevated errors on platform.claude.com — ongoing, 6d ago
- Issue with spend limits — resolved, 6d ago
- Elevated errors loading usage data on platform.claude.com — resolved, 6d ago
- Elevated errors for Claude Opus 5.5 — resolved, 7d ago
- Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1 — resolved, 8d ago
- Delayed credits on the Claude Platform — resolved, 12d ago