AWS Bedrock to require sharing data with Anthropic for Mythos and future models

#1

Post by TomAnthony » Wed, Jun 10, 2026, 8:21 AM UTC

> For Fable 5, Mythos 5, and future models on Bedrock with similar or higher capability levels, Anthropic will require 30-day retention for all traffic on Mythos-class models. Retaining data for a limited period allows Anthropic to detect patterns of misuse that are not visible from a single exchange. Once you opt into data retention, your data will leave AWS’s data and security boundary.

From the announcement here: https://aws.amazon.com/blogs/aws/anthropic-claude-fable-5-on...

> After 30 days, the data is deleted automatically, except in the rare cases where it's part of a safety investigation or we're legally required to keep it.

From: https://support.claude.com/en/articles/15425996-data-retenti...

Re: AWS Bedrock to require sharing data with Anthropic for Mythos and future models

#2

Post by rohansood15 » Wed, Jun 10, 2026, 8:55 AM UTC

Pretty sure this doesn't work for any regulated enterprise or government client. But AWS knows this, so I am curious why they'd agree to it.

Re: AWS Bedrock to require sharing data with Anthropic for Mythos and future models

#3

Post by officialchicken » Wed, Jun 10, 2026, 9:06 AM UTC

"Legally required" ... gotcha, script writing on Melania Movie 3 has begun in exchange for a national security letter requiring Amazon to both keep the data and not exclude it from training.

Re: AWS Bedrock to require sharing data with Anthropic for Mythos and future models

#4

Post by Torikul007 » Wed, Jun 10, 2026, 9:06 AM UTC

I understand the safety/misuse argument, but I wonder where enterprises will draw the line here. “30-day retention for advanced models” sounds reasonable in isolation, until you remember many teams are sending proprietary code, internal docs, or customer-sensitive context through these systems.