New incident: Elevated errors on Claude Sonnet 5

Anthropic is investigating elevated errors on Claude Sonnet 5 as of Jul 8. A previous incident on Opus 4.8 has been resolved. Users may experience degraded performance on Sonnet 5.

Jul 8, 2026Views:0

Impact Assessment

Cost0

Reliability4

Migration0

Quality2

Compliance0

Elevated errors affect reliability and may degrade output quality for Sonnet 5 users. No cost or migration impact.

Changes

Before

Elevated error rates on Opus 4.8 | https://status.claude.com/incidents/7ykkywg6yln4 | &lt;p&gt; &lt;small&gt;Jun &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;15:28&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;Jun &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:45&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;Jun &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;14:31&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Investigating&lt;/strong&gt; - We are currently investigating elevated error rates on Opus 4.8. Our team is actively working to identify the root cause. &lt;/p&gt;

After

Elevated errors on Claude Sonnet 5 | https://status.claude.com/incidents/n3v83qmtlbqm | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt; 8&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;06:26&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/n3v83qmtlbqm | <p> <small>Jul <var data-var='date'> 8</var>, <var data-var='time&a...

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