AWS Bedrock to require sharing data with Anthropic for Mythos and future models
114
TTomAnthony about 3 hours ago 51 comments
ES version is available. Content is displayed in original English for accuracy.
> 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-aws-mythos-class-capabilities-with-built-in-safeguards-now-available/
> 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-retention-practices-for-mythos-class-models
Discussion (51 Comments)Read Original on HackerNews
> For OpenAI GPT-5.4 and GPT-5.5, classifier-flagged traffic will be retained for up to 30 days for automated offline abuse detection
https://docs.aws.amazon.com/bedrock/latest/userguide/abuse-d...
Anthropic is trying, well see if it's a bold strategy.
1. https://github.blog/changelog/2026-06-09-claude-fable-5-is-g...
that's obvious, but perhaps worth stating: it's worth it, demand for the model is unprecedented and the only downside for Anthropic if AWS rejected would be some revenue pushed a quarter away as they get Fable ready on their recently acquired compute from xAI and Google.
I don't think it mentions sharing the data with third parties such as Anthropic?
From https://support.claude.com/en/articles/15425996-data-retenti...
I've worked on a few apps for UKGov and I would absolutely be raising this as a massive red flag.
"For more on how Anthropic handles this data, see Anthropic’s commercial terms and data retention policy. Enabling the Claude Fable 5 policy constitutes acknowledgement of this requirement. Leaving it off keeps Claude Fable 5 unavailable to your organization."
https://github.blog/changelog/2026-06-09-claude-fable-5-is-g...
It is literally 10X to 20-X cheaper to directly buy Anthropic subscriptions for your devs.
We 'trust' Amazon already and Amazon has no incentive at all to collect the data to finetune claude because they don't own claude.
I only told a commentor why a business would pay more to Amazon than going directly to Anthropic.
The announcement itself is def problematic and either leads to big companies accepting this and then going directly to anthropic or some talks in the background we don't know yet what it will entail.
Their carve-outs for safety (public interest) and legal are also valid exceptions in gdpr as well.
> After 30 days, the data is deleted automatically
Do we believe that?
> or we're legally required to keep it.
Aha - so, data is forever.
If you don't believe them now why would you have believed them earlier when they said "no data is retained" ?
Well, that's the final frontier anyway.
So basically all your data will flow to NSA/CIA/Mossad if they show even slight interest in your org or you as a person. Gotcha.
Even in the happy case where nothing bad happens, you get a badly integrated product, because you integrate not against the actual vendor, but against a abstraction layer that commoditizes the actual product, effectively forcing you to either use the least common denominator of features, or circumventing the actual aggregation model itself with some kind of 'vendor_specific_parameters' parameter in the aggregator API.
My thesis is drop the vendor neutrality, and build your integration with the vendor directly.