Opus 4.5 elevated error rates resolved, now monitoring

An incident causing elevated error rates for Opus 4.5 has been resolved. The status page was updated from 'Investigating' and 'Identified' to 'Monitoring' after a fix was implemented. This indicates the issue is under control but still being watched.

Jul 20, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality1

Compliance0

Reliability impact during the incident; now mitigated. No cost, migration, or compliance effects.

Changes

Before

Elevated error rates for Opus 4.5 | https://status.claude.com/incidents/hlt0yqp4lkww | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;20&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:05&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;20&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;07:57&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;20&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;Investigating&lt;/strong&gt; - We are currently investigating this issue. &lt;/p&gt;

After

Elevated error rates for Opus 4.5 | https://status.claude.com/incidents/hlt0yqp4lkww | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;20&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:57&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;20&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:05&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;20&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;07:57&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;20&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;Investigating&lt;/strong&gt; - We are currently investigating this issue. &lt;/p&gt;

Sources

status

Anthropic Status History

Elevated error rates for Opus 4.5 | https://status.claude.com/incidents/hlt0yqp4lkww | <p> <small>Jul <var data-var='date'>20</var>, <var data-var='time&ap...

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