Ampersand from Humans& now available on AI Gateway
Source
vercel.com
Author
Gregor Martynus
Date
Why it matters
Humans& Ampersand is a model for multi-party conversations that chooses each turn between send_message and pass, so you can build group-chat agents that stay quiet when appropriate. Free on AI Gateway through November 13, 2026.
Key takeaways · AI-distilled
Humans& built Ampersand (humansand/ampersand-v0.1) for group chats: each turn it decides whether to speak or stay quiet, aiming to ask clarifying questions, add context windowThe maximum amount of text a model can consider at once — its working memory for the current conversation or task.Full definition →, or wait while people talk. It is free on Vercel AI Gateway through November 13, 2026.
Speaking and silence are caller-defined tools that your app executes: send_message posts a contribution and pass stays quiet until the next human message. Ampersand accepts tool choice auto or none but rejects required and named choices, so leave it at the default.
For deployed chat apps, Vercel recommends durably storing the response, history and delivery receipts, retrying an uncertain delivery with the saved action and same receipt, processing messages one at a time per conversation, and checking access before posting.
Terms in this piece · Glossary
context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
