Elevated errors across many models resolved

An incident causing elevated errors across multiple Anthropic models (Sonnet 5, Opus 5, Fable 5, Opus 4.7, Opus 4.5) has been resolved. The issue was identified, monitored, and marked resolved as of Jul 30, 10:48 UTC.

Jul 30, 2026Views:0

Impact Assessment

Cost0

Reliability4

Migration0

Quality0

Compliance0

Reliability impact was significant during the incident, affecting multiple models with elevated error rates. Now resolved.

Changes

Before

Elevated errors across many models | https://status.claude.com/incidents/fsh2zzzl2c4l | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:23&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are also investigating issues with Opus 4.7 and Opus 4.5. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:03&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Monitoring&lt;/strong&gt; - As of 2:58 PT / 9:58 UTC the errors are back to baseline. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;08:33&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - As of 01:33 PT / 08:33 UTC we are back to errors across all models. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;08:06&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - As of 8:05 UTC / 1:05 PT, Sonnet 5 errors are back to baseline, but we&apos;re seeing an increased error rate on Fable 5. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;07:33&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - As of 7:32 UTC / 0:32 PT, Opus 5 errors are back to baseline but we&apos;re seeing again Sonnet 5&apos;s errors up. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&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;Identified&lt;/strong&gt; - All models except Opus 5 have recovered. We&apos;re working to recover Opus 5 as well. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;05:57&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 many models | https://status.claude.com/incidents/fsh2zzzl2c4l | &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:48&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;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:23&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - We are also investigating issues with Opus 4.7 and Opus 4.5. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;10:03&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Monitoring&lt;/strong&gt; - As of 2:58 PT / 9:58 UTC the errors are back to baseline. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;08:33&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - As of 01:33 PT / 08:33 UTC we are back to errors across all models. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;08:06&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - As of 8:05 UTC / 1:05 PT, Sonnet 5 errors are back to baseline, but we&apos;re seeing an increased error rate on Fable 5. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;07:33&lt;/var&gt; UTC&lt;/small&gt;&lt;br&gt; &lt;strong&gt;Update&lt;/strong&gt; - As of 7:32 UTC / 0:32 PT, Opus 5 errors are back to baseline but we&apos;re seeing again Sonnet 5&apos;s errors up. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&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;Identified&lt;/strong&gt; - All models except Opus 5 have recovered. We&apos;re working to recover Opus 5 as well. &lt;/p&gt; &lt;p&gt; &lt;small&gt;Jul &lt;var data-var=&apos;date&apos;&gt;30&lt;/var&gt;, &lt;var data-var=&apos;time&apos;&gt;05:57&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 across many models | https://status.claude.com/incidents/fsh2zzzl2c4l | <p> <small>Jul <var data-var='date'>30</var>, <var data-var='time&a...

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