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All agents  /  Claude Code  /  History  /  Aug 18, 2026

Claude Code outage on Aug 18, 2026: degraded performance for multiple models

Resolved after 2 h 41 min.

16:20 UTC to 19:01 UTC your time. Anthropic: “Degraded performance for multiple models.” 0 reports here during the incident.

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Reports during the incident

Every 15 minutes, 15:15 UTC to 20:15 UTC. Grey: normal. Red line: official incident.
15:15 UTC16:20 UTC19:01 UTC20:15 UTC

What people reported

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Anthropic's updates

Quoted from status.claude.com

  1. 16:20 UTC

    Investigating

    We are investigating reports of degraded performance affecting multiple models. We will provide an update as soon as possible.

  2. 16:20 UTC

    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.

  3. 17:12 UTC

    Investigating

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

  4. 18:26 UTC

    Monitoring

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

  5. 19:01 UTC

    Resolved

    The issue affecting Claude Opus 5 has been resolved. Impact occurred from 16:11 to 18:23 UTC.

Other Claude Code incidents

Nov 826 minDegraded performance for Claude Fable 5.1Details
Oct 283 h 46 minElevated errors affecting the Google Calendar connectorDetails
Oct 281 h 49 minElevated errors affecting the Gmail connectorDetails
All Claude Code incidents

Other agents

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