Elevated errors on Sonnet 5 and Haiku 4.5 resolved

An incident causing elevated errors on Sonnet 5 and Haiku 4.5 has been resolved. The issue was identified, a fix implemented, and monitoring confirmed resolution. Users may have experienced errors between approximately 06:47 and 12:21 UTC on July 17.

Jul 17, 2026Views:0

Impact Assessment

Cost0

Reliability3

Migration0

Quality0

Compliance0

Elevated errors on two models for about 5.5 hours. No cost or migration impact, but reliability was affected during the incident window.

Changes

Before

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;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 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;

Sources

status

Anthropic Status History

Elevated errors on Sonnet 5 and Haiku 4.5 | https://status.claude.com/incidents/7gpjd8n56rlq | <p> <small>Jul <var data-var='date'>17</var>, <var data-var=&apos...

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