Elevated errors across many models - ongoing incident

An incident of elevated errors across multiple models (Sonnet 5, Fable 5, Opus 5) is being updated. Some models have recovered, but errors persist on others. The incident started around 05:57 UTC on July 30 and is still being investigated.

Jul 30, 2026Views:0

Impact Assessment

Cost0

Reliability4

Migration0

Quality3

Compliance0

Ongoing elevated errors affect multiple models, causing degraded reliability and potential quality issues for users. No cost or migration impact.

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;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;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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