Something is fishy with “Data Retention” of Anthropic models on AWS Bedrock

Something is fishy with “Data Retention” of Anthropic models on AWS Bedrock.

As you may know, I am currently doing rounds of playtesting for the indie game I am working on that teaches Cloud Infrastructure principles and practices.

This morning I was doing my normal research for my daily writing practice when I came across an article about how people were automating Game testing on AWS.

I thought, “I don’t really want to use AI to write the game, but it would be nice to flush out bugs before a human finds them”.

So I decided to give Fable 5 via AWS Bedrock a spin locally in a Docker container to see if it lived up to the hype.

When I went to run the model, I got the following error:

ValidationException
The model returned the following errors: data retention mode 'default' is not available for this model

I did a bit of poking around and found out there is a hidden setting called Data retention.

I say hidden because they have no UI for it in the console, only an API call, and they openly admit this in the docs.

It appears that Anthropic is forcing AWS to force you to share your data with Anthropic. For your own good, I am sure…(That was sarcasm in case you missed that).

Here it is in their words:

Claude Fable 5 and Claude Mythos 5 require provider data sharing (allowed_modes: ["provider_data_share"]). Customers must explicitly set their data retention mode to provider_data_share before they can invoke these models. If your effective mode is none or default, these models will be unavailable.

By setting provider_data_share, you are explicitly acknowledging instructing us to retain and share data with model providers per their requirements. It is required for access to certain models. See the Abuse Detection page and AWS Service Terms

Now it’s possible this data retention feature existed before Fable 5, but the earliest mention of it I could find was the Fable 5 launch post on Jun 9th 2026.

So it looks like AWS added this setting just to appease Anthropic’s lust for your data.

With that said, perhaps everything is fine and there is nothing to see here.

Let me know what your thoughts are on this.

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