Ampersand from Humans& is now available on AI Gateway for free through November 13, 2026.
Ampersand is a language model built to take part in group conversations, such as a team chat, and to decide on each turn whether to speak or stay quiet. It is designed to understand individual and shared goals, help people work through disagreements, and recognize when a contribution would be useful. That can mean asking a clarifying question, sharing relevant context, or waiting while people respond to one another.
Your application exposes these actions as caller-defined function tools. send_message delivers a contribution, while pass leaves the conversation quiet until the next human message. Your application executes both tools and records their results. Leave tool choice at its default, since Ampersand accepts auto and none but rejects required and named tool choices.
Call it through the AI SDK, the OpenAI-compatible Chat Completions API, or a coding agent. Use humansand/ampersand-v0.1 as the model name:
The first human message invites a contribution; the second asks Ampersand to wait. In a chat application, call the handler when a new human message arrives. Handling pass records the waiting action without posting a message or starting another model turn. For a deployed chat application, persist the response, history, and delivery receipts in durable storage. Retry uncertain delivery with the saved action and the same receipt, process messages sequentially per conversation, and check conversation access before posting.
To use it in Claude Code, Codex, Cursor, and more, install the latest Vercel CLI and run setup:
Then select `humansand/ampersand-v0.1` in the agent. See the [coding agents guide](https://vercel.com/docs/ai-gateway/coding-agents) for details.
Try Ampersand in the [model playground](https://vercel.com/ai-gateway/models/ampersand-v0.1).
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