Most chat assistants respond when spoken to. Humans&' Ampersand is designed for a different problem: participating in a conversation among several people and deciding when not to interrupt. Vercel announced access through its AI Gateway on November 6. This report was published November 8.
Speaking and passing
Vercel says the model was built on Z.ai's open-weight GLM 5.3 and trained using simulated group conversations. An application supplies two functions: one sends a message, and one passes without a reply. The application remains responsible for executing those actions and maintaining its conversation state.
Vercel advertises free access through November 13. That promotional period is not a promise of permanently free service, nor does it establish that Ampersand weights are downloadable. Check the current terms and pricing before building a dependency on a hosted model.
The practical challenge
Choosing silence can make a shared assistant less intrusive, but it introduces questions about consent, privacy, missed interventions and when the model sees messages. Builders should make those boundaries visible and test the behavior with the people using the chat. We have not tested the model ourselves.
Original reporting; claims attributed to their sources. No local tests implied.
