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Anthropic has mandated 30-day data retention for Claude Fable 5 models

only one source so far

According to Anthropic, Claude Fable 5 models require data retention of at least 30 days in the API; zero retention is not available without explicit approval from Anthropic. The same rule also applies to other models that are not specified further.

According to the release notes for Claude Platform, Claude Fable 5 models require data retention of at least 30 days within the API. Zero data retention is not available for these models unless Anthropic explicitly approves it. According to the source, the same condition also applies to other models that are not specified further in the available text (“both models”), for which the policy refers to the settings already established for the Claude Fable 5 model.

The source does not state when this policy was introduced or why it was set this way. Details, including which specific models “both models” refers to and exactly how the exception approval process works, can be found in the source article.

What changed

Why it matters

Companies and developers with contractual or regulatory obligations to ensure zero data retention (e.g. in healthcare, finance or public administration) cannot automatically meet this requirement when using Claude Fable 5 models — they must request an explicit exception from Anthropic; otherwise, data remains stored for at least 30 days.

Two audiences, two different impacts

What this means

01

For individuals

Developers working with the API for the Claude Fable 5 model must expect data to remain stored by Anthropic for at least 30 days unless they secure an explicit exception.

What to do Before deploying the Claude Fable 5 model in a project, check whether the client or internal policy requires zero data retention and, if so, expect to need to request an exception.
More practical updates →
02

For a business

Companies with contractual or regulatory obligations to ensure zero data retention must expect data retention of at least 30 days by Anthropic when using Claude Fable 5 models, unless they explicitly request an exception.

Risks and compliance
What to decide Check with the legal/compliance department whether deploying Claude Fable 5 models requires zero data retention and, if so, ask Anthropic for explicit approval of an exception.
More business impacts →
Anthropic API Claude Fable 5 Data protection data retention

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Event sources

only one source so far · 1 publisher, 0 independent. We count feeds from the same owner only once.

1
Claude Platform Release Notes primary source · first detected Like Claude Fable 5, both models require 30-day data retention and aren't available under zero data retention unless expressly authorized by Anthropic. See Model-specific data…