Claude Sonnet 5 elevated errors resolved, monitoring ongoing

An incident causing elevated errors on Claude Sonnet 5 was investigated and a fix implemented; status moved to monitoring. A prior Opus 5 incident was resolved and removed from the feed.

Aug 4, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality0

Compliance0

Reliability impact is moderate due to elevated errors on Sonnet 5, but the issue is now being monitored and likely resolved. No cost, migration, quality, or compliance impact.

Changes

Before

Elevated errors for Opus 5 | https://status.claude.com/incidents/zftg3gqkmv18 | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;26&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:44&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;26&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:34&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;26&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:28&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are continuing to work on a fix for this issue. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;26&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;09:45&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;26&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;09:17&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 Sonnet 5 | https://status.claude.com/incidents/8k9mjhq7wmv3 | &lt;p&gt; &lt;small&gt;Aug &lt;var data-var=&apos;date&apos;&gt; 4&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;06:28&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; 4&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;06:16&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 Sonnet 5 | https://status.claude.com/incidents/8k9mjhq7wmv3 | <p> <small>Aug <var data-var='date'> 4</var>, <var data-var='time&a...

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