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With Attitude

Posted on • Originally published at karozieminski.substack.com

Anthropic Just Split the Frontier in Two

Fable 5 is the model we get. Mythos 5 is the model we don’t. The gap between them is the product strategy.

When a company announces two products from one model, the model is no longer the only thing being productized.

Today, Anthropic launched Claude Fable 5 and Claude Mythos 5.

Same underlying model. Different doors. Different rules.

This must be an interesting time to be a PM at Anthropic.

The model creates the capability, but the product is shaped in the access layer: segments, permissions, routing, eligibility, pricing, governance, and trust.


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