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Anthropic: Degraded performance for multiple models

Affected components: Claude CoworkClaude API (api.anthropic.com)claude.aiClaude Code

Timeline of updates

1. investigating2026-08-18 16:20 UTC

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

2. investigating2026-08-18 16:20 UTC

   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. investigating2026-08-18 17:12 UTC

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

4. monitoring2026-08-18 18:26 UTC

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

5. resolved2026-08-18 19:01 UTC

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

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Anthropic profile · Recent Anthropic incidents · Markdown · JSON