Hemmingway-1.5 is our newest model, and the one Hemmingway writes with. Hemmingway-1, our first, is still here. Unlocked is for adults.
The undetectable AI.
Writing indistinguishable from a human’s. It passes the world’s best AI detectors 90% of the time, at every thinking level.
90%pass GPTZero and the top AI detectors
1stat sounding like a person, in our blind test
hemmingway-1.5For the way it wrote before.
Warm, plain writing for everyday messages and emails. It is still in the API, and its weights are open.
hemmingway-1For adult fiction and roleplay.
Explicit and dark stories, roleplay and chat, with a short list of things it never writes.
GPTZero read Hemmingway-1’s writing as 100% AI. Hemmingway-1.5 passes it 90% of the time, at every thinking level.
In the API, the model ids are hemmingway-1.5, the default, and hemmingway-1. The old id hemmingway-27b still works and means Hemmingway-1. Models in the docs.
Hemmingway-1.5 is already in the app. Try it free, no account needed.