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This incident has been resolved.
Access to 3.5 Sonnet has been restored for free Claude.ai users, and we are closely monitoring.
We are continuing to work to resolve issues in order to re-enable free Claude.ai 3.5 Sonnet for users. Other usage of 3.5 Sonnet is unaffected.
We are continuing to work on a fix for this issue.
There are infrequent errors occurring on 3.5 Sonnet for API users, and free usage of Claude.ai is still routing to Claude 3 Haiku. We are continuing to work to restore access and will provides updates as we have them.
We have temporarily routed free usage on Claude.ai to Claude 3 Haiku and will restore 3.5 Sonnet as soon as possible.
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