Claude Haiku 4.5 incidents resolved after error spikes

Anthropic resolved two incidents on Aug 3 affecting Claude Haiku 4.5 and other models: elevated error rates across multiple models (resolved ~14:17 UTC) and degraded performance on Claude Sonnet 5 (resolved ~15:20 UTC). Both returned to baseline; no ongoing impact.

Aug 3, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality0

Compliance0

Temporary reliability degradation for Claude Haiku 4.5 users during the incidents; now resolved. No cost, migration, quality, or compliance impact.

Changes

Before

Error rates across multiple models | https://status.claude.com/incidents/ch7k4vh9fr1y | &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:30&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Monitoring&lt;/strong&gt; - A fix has been implemented and we are monitoring the results. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;12:52&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;
Elevated errors for Claude Fable 5, Claude Sonnet 5, Claude Haiku 4.5, and other models | https://status.claude.com/incidents/j6gv862066n7 | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;25&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;22:08&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Resolved&lt;/strong&gt; - This incident has been resolved. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;25&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;21:34&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Investigating&lt;/strong&gt; - We are investigating elevated errors on requests to Claude Fable 5, Claude Sonnet 5, Claude Haiku 4.5, and other Claude models. We will provide an update as soon as possible. &lt;/p&gt;

After

Degraded performance on Claude Sonnet 5 | https://status.claude.com/incidents/dnl3q35xkn3s | &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;15:29&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Resolved&lt;/strong&gt; - As of 15:20 UTC (8:20am PT), error rates on Claude Sonnet 5 have returned to baseline. This incident is resolved. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;15:13&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;
Error rates across multiple models | https://status.claude.com/incidents/ch7k4vh9fr1y | &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:17&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Resolved&lt;/strong&gt; - This incident has been resolved. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:30&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Monitoring&lt;/strong&gt; - A fix has been implemented and we are monitoring the results. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 3&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;12:52&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

Degraded performance on Claude Sonnet 5 | https://status.claude.com/incidents/dnl3q35xkn3s | <p> <small>Aug <var data-var='date'> 3</var>, <var data-var='t...

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