Claude Fable 5 on Bedrock Requires Sharing Inference Data with Anthropic
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Data sharing implications for Claude on Bedrock, critical for cloud AI deployments.
Anthropic's Claude Fable 5 and Mythos 5 on Amazon Bedrock require opting into provider_data_share, sending prompts and outputs to Anthropic for 30-day retention with human review—a break from prior models where inference data stayed within AWS's boundary. This policy, dictated by Anthropic not AWS, forces regulated organizations to update DPAs, sub-processor lists, and address CLOUD Act exposure for EU entities, while healthcare teams face BAA gaps. The change undermines Bedrock's core value proposition of neutral data residency, drawing sharp criticism from security researchers and practitioners.