Anthropic just released its most powerful public model yet — Claude Fable 5. However, along with the model's release, the AI giant also made a significant update to its data retention policies.Fable 5 was released to the public on Tuesday. Fable 5 is a "safe for general use" version of Anthropic's most powerful model, Mythos, which has been restricted from public use due to its potentially dangerous cybersecurity capabilities. Anthropic created a set of safety guardrails for Fable 5, and its benchmarks blow away much of the competition, per Anthropic.But it looks like Anthropic has also blown away its data retention policies for Fable 5.
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"To ensure we’re responsibly deploying Mythos-class models, we are requiring limited data retention and review as part of our safety work," reads an update on Anthropic's official Claude support page. "Prompts submitted to, and outputs generated by, Mythos-class models are retained for 30 days for trust and safety purposes, on every platform where these models are offered."The update was first noticed by Jun Park, the CEO of AI training company hillclimb.
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“New policy from Anthropic: if you use Fable/Mythos, they collect your data. No exceptions. Not even for enterprise partners," Park posted on X.











