Elevated errors on Claude Haiku 4.5 and other models resolved

Two incidents affected Claude Haiku 4.5: one with elevated errors across models (now resolved) and a new incident for Fable 5 (identified, fix in progress). A prior incident from Jul 17 is now removed from the status history.

Jul 21, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality0

Compliance0

Reliability impact due to elevated errors on Haiku 4.5 and other models; one incident resolved, another still being fixed.

Changes

Before

Elevated errors across models | https://status.claude.com/incidents/y65gwqbztbsp | &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;10:11&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Investigating&lt;/strong&gt; - We are currently investigating issues with Claude Haiku 4.5 and Opus 4.8. &lt;/p&gt;
Elevated errors on Sonnet 5 and Haiku 4.5 | https://status.claude.com/incidents/7gpjd8n56rlq | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;17&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;12:21&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;17&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;07:10&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;17&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;07:03&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;17&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;06:47&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 across Fable 5 | https://status.claude.com/incidents/lw0sb1srtznh | &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;11:28&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;11:24&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;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;11:19&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 across models | https://status.claude.com/incidents/y65gwqbztbsp | &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;11:18&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;21&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;11:10&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;10:11&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Investigating&lt;/strong&gt; - We are currently investigating issues with Claude Haiku 4.5 and Opus 4.8. &lt;/p&gt;

Sources

status

Anthropic Status History

Elevated errors across Fable 5 | https://status.claude.com/incidents/lw0sb1srtznh | <p> <small>Jul <var data-var='date'>21</var>, <var data-var='time'...

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