Elevated errors on multiple Claude models, partial recovery

An incident caused elevated errors on several Claude models (Sonnet 5, Fable 5, Opus 5). Opus 5 and Sonnet 5 have recovered, but Fable 5 is now experiencing increased error rates. Users may still see intermittent failures.

Jul 30, 2026Views:0

Impact Assessment

Cost0

Reliability4

Migration0

Quality2

Compliance0

Reliability impact is high due to ongoing errors on Fable 5; quality may be affected for users relying on that model.

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;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;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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