The reason is quite hilarious ππ.
Microsoft put $50 billion into Anthropic.
FIFTY billion dollars.
they are a Project Glasswing partner. Fable 5 runs inside Azure. Microsoft sells Claude to its own enterprise customers through Microsoft 365 and GitHub Copilot.
and they won't let their own employees use it.
here's why.
under Anthropic's new Mythos-class data retention policy, every prompt you type and every response you get is stored for 30 days. automatically. no opt out.
if their safety classifiers flag anything in your session, anything, they keep it for up to two years.
you don't get told when that happens, what was flagged or who can see it.
Microsoft employees paste confidential contracts into these things. customer data. internal roadmaps. acquisition strategies. legal documents. source code.
all of it sitting on Anthropic's servers for 30 days minimum. flagged sessions for two years.
so the company that invested $50 billion looked at that policy and told its staff: actually hold on.
other Claude models still work internally. under Zero Data Retention rules. the normal ones are fine.
just not the most powerful one they helped fund.
and one more thing.
the Pentagon listed Anthropic as a supply chain risk in March and banned defense contractors from using its products.
Microsoft funds Anthropic. sells Anthropic's models. runs them on Azure. helped build the most powerful one.
won't let employees use it.
the Pentagon won't let defense contractors near it.
the safeguard that makes Fable 5 safe enough to release publicly is the same safeguard that lets Anthropic keep your data for two years.
the guardrail is a data retention policy.
but you can use it. it's in your browser right now. π
have fun.
JUST IN: Microsoft has reportedly restricted employee use of Claude Fable 5 over concerns that confidential data could be retained by Anthropic.