Elevated errors across multiple Anthropic models

Anthropic is investigating and resolving elevated error rates affecting Opus 4.7, Opus 4.5, Sonnet 5, and Fable 5 models. Most models have recovered, but Opus 5 and others experienced intermittent issues. The incident is ongoing with monitoring in place.

Jul 30, 2026Views:0

Impact Assessment

Cost0

Reliability4

Migration0

Quality2

Compliance0

Multiple models affected by elevated errors, causing degraded reliability. No pricing or compliance impact. Quality may be affected for models still experiencing issues.

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;08:33&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;10:23&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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