Claude Opus 5 and Haiku 4.5 errors resolved

An incident causing elevated errors on Claude Opus 5 and Haiku 4.5 has been resolved as of July 27, 14:34 UTC. The issue was investigated and errors returned to baseline.

Jul 27, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality0

Compliance0

The incident affected reliability of two models (Opus 5 and Haiku 4.5) for about 55 minutes. No cost, migration, quality, or compliance impact.

Changes

Before

Elevated errors on Claude Opus 5 and Haiku 4.5 | https://status.claude.com/incidents/rkk5x44tndw9 | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:04&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - Haiku 4.5 is also returning errors. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:42&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are currently investigating this issue. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:41&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are continuing to investigate this issue. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:39&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Investigating&lt;/strong&gt; - We are currently investigating this issue. &lt;/p&gt;

After

Elevated errors on Claude Opus 5 and Haiku 4.5 | https://status.claude.com/incidents/rkk5x44tndw9 | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:36&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Resolved&lt;/strong&gt; - As of 7:34 PST / 14:34 UTC the errors have returned to baseline. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:04&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - Haiku 4.5 is also returning errors. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:42&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are currently investigating this issue. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:41&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are continuing to investigate this issue. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;27&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:39&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Investigating&lt;/strong&gt; - We are currently investigating this issue. &lt;/p&gt;

Sources

status

Anthropic Status History

Elevated errors on Claude Opus 5 and Haiku 4.5 | https://status.claude.com/incidents/rkk5x44tndw9 | <p> <small>Jul <var data-var='date'>27</var>, <var data-var=...

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