Anthropic's Mythos 5 en Bedrock requiere 30 días de sus datos - Fuera de AWS

Anthropic's Mythos 5 and Fable 5 models on AWS Bedrock now require you to hand over 30 days of traffic data — and that data leaves AWS's security boundary.

The 30-Day Data Grab

For Fable 5, Mythos 5, and any future models on Bedrock with similar capability levels, Anthropic demands 30-day retention of all traffic. From the AWS announcement: "Retaining data for a limited period allows Anthropic to detect patterns of misuse that are not visible from a single exchange." Once you opt in, your data exits AWS's data and security boundary — full stop.

What Leaves AWS's Boundary

Anthropic's support article clarifies: after 30 days, data is deleted automatically, except when it's part of a safety investigation or legally required to keep it. That means your prompts, completions, and metadata are inspectable by Anthropic for a month. For any enterprise operating under strict compliance regimes (HIPAA, SOC 2, FedRAMP), this is a dealbreaker unless you control the boundary.

Why This Changes the Bedrock Calculus

AWS Bedrock's selling point has been keeping your data within AWS's perimeter. This policy explicitly breaks that promise for Anthropic's highest-capability models. The justification — detecting multi-turn abuse patterns — is legitimate, but the mechanism (30-day raw data storage on Anthropic's infrastructure) raises the bar on risk acceptance. If you're building on Bedrock, assume your prompt data is inspectable by Anthropic for 30 days — and plan accordingly.

Source: AWS Bedrock to require sharing data with Anthropic for Mythos and future models
Domain: news.ycombinator.com