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Increased request error rates for Claude Mythos 5.1 and Claude Fable 5.1 are under investigation

clearly official source

The Claude Status page reported increased error rates for requests to Claude Mythos 5.1 and Claude Fable 5.1 on 5 October at 13:05 UTC. The incident is under investigation.

According to the Claude Status page, requests to Claude Mythos 5.1 and Claude Fable 5.1 are experiencing increased error rates. The announcement from 5 October at 13:05 UTC states that the incident is under investigation.

The operator promised another update as soon as possible. The announcement does not specify the cause, the error rate or the expected time of resolution.

What changed

Why it matters

This is an ongoing operational issue that may affect the completion of tasks using both models. The announcement does not yet make it possible to determine how often requests fail or how long the problems will last.

Two audiences, two different impacts

What this means

01

For individuals

When working with Claude Mythos 5.1 and Claude Fable 5.1, you may encounter request errors more frequently and fail to receive the expected result.

What to do If you encounter problems, check the current incident status on the Claude Status page.
More practical updates →
02

For a business

For business processes that depend on these models, increased error rates pose a risk of incomplete tasks; the extent of the impact on any particular operation is not yet known.

Processes
What to decide Check the error rates for requests to both models in your own environment.
More business impacts →
Claude Fable 5.1 Claude Mythos 5.1 Claude Status

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Event sources

clearly official source · 1 publisher, 0 independent. We count feeds from the same owner only once.

1
Claude Status — incident history official service status · first detected Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1