# Chat

A **chat** is a conversation scoped to a fixed set of documents and/or
papers. The scope is set at creation and does not drift.

## Shape

```json
{
  "object": "chat",
  "id": "chat_1r8eaidwoq",
  "document_ids": [
    "doc_8ba2f01c47"
  ],
  "paper_ids": [],
  "depth": "standard",
  "message_count": 2,
  "created_at": "2026-08-11T09:29:44Z"
}
```

## Why scope is explicit

A chat only sees what you named. This is what makes answers auditable — and it is the difference from
Search, which chooses its own sources from the corpus.

## Related

chats · message · document · grounded-answers