Haiku 4.5 elevated errors incident resolved

An incident of elevated errors on Haiku 4.5 was investigated, identified, and fixed. The status page was updated to reflect the fix and ongoing monitoring. No further action is needed.

Jul 21, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality0

Compliance0

The incident affected reliability for Haiku 4.5 users during the event. It has been resolved and is now in monitoring phase.

Changes

Before

Elevated errors on Haiku 4.5 | https://status.claude.com/incidents/j0y67nj6w93z | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:22&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;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:14&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Identified&lt;/strong&gt; - The issue has been identified and a fix is being implemented. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:04&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 Haiku 4.5 | https://status.claude.com/incidents/j0y67nj6w93z | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:44&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Identified&lt;/strong&gt; - The issue has been identified and a fix is being implemented. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:22&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;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:14&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Identified&lt;/strong&gt; - The issue has been identified and a fix is being implemented. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;13:04&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 Haiku 4.5 | https://status.claude.com/incidents/j0y67nj6w93z | <p> <small>Jul <var data-var='date'>21</var>, <var data-var='time'&g...

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