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POST
Create chat completion

Authorizations

Authorization
string
header
required

API key for authentication. Format: gcai_xxxxxxxxx

Create API keys in the GC AI app under Settings → API.

Headers

Prefer
string

Optional RFC 7240 wait preference, for example wait=0. If both this header and the wait query parameter are supplied, they must match.

Example:

"wait=0"

Query Parameters

wait
integer | null

Optional long-poll wait time in seconds. Use 0 for fire-and-forget behavior. If both wait and Prefer: wait=... are supplied, they must match. Values above 90 are clamped.

Required range: x >= 0
Example:

0

Body

application/json
message
string
required

The user's message or prompt

Minimum string length: 1
Example:

"What are the key terms to look for in a software license agreement?"

file_ids
string<uuid>[]

Optional uploaded file IDs to attach as context for this completion. Upload files first via POST /files.

Example:
playbook_ids
string<uuid>[]

Optional playbook IDs to ground the completion in (up to 20). The model uses each playbook's checks and guidance to structure its review of the attached files. Discover playbooks via GET /playbooks.

Org-scoped keys can use org-visible and official playbooks.

Maximum array length: 20
Example:
playbook_id
string
deprecated

Deprecated and no longer accepted. Use playbook_ids (an array) instead. Requests that include this field are rejected with a 400 so the playbook is never silently dropped.

skill_ids
string<uuid>[]

Optional skill IDs to run on the first turn. Each skill's instructions are injected as context for this completion. Discover skills via GET /skills.

Only valid when starting a new chat; omit them when continuing with chat_id.

Example:
chat_id
string<uuid>

Optional chat ID to continue an existing conversation, from the chat_id of a prior completion. Omit to start a new chat.

Conversation state is held server-side, so send only your new message (plus any new file_ids); do not re-send prior turns or previously returned documents/emails/diagrams. Only one turn may be in flight per chat at a time. See Multi-turn Conversations.

Example:

"a1b2c3d4-e5f6-7890-abcd-ef1234567890"

project_id
string<uuid>

Optional project to file the chat into. Requires write access to the project. Discover projects via GET /projects.

This does two things: it grounds the completion in the project's files, and it files the chat under that project. Filing alone does not make the chat visible to people, because API chats stay out of chat history until they are materialized. Pass materialize: true (or call POST /chat/{id}/materialize afterwards) for the chat to appear under GET /projects/{id}/chats and in the GC AI web app. See Chat Visibility.

Example:

"d4c3b2a1-f6e5-0987-dcba-fedcba098765"

materialize
boolean

Surface this chat into chat history as part of the same call, instead of making a second request to POST /chat/{id}/materialize. Defaults to false, which keeps the chat headless.

Set this when a person is meant to open the chat. An organization-scoped key shares the materialized chat with the whole organization, so any member can open it and keep chatting in it. A user-scoped key keeps the chat owned by the caller.

On success the response includes chat_url. If that field is absent, materialization did not happen and the chat is still headless; retry with POST /chat/{id}/materialize using the returned chat_id. Continuing an already-materialized chat is a no-op. See Chat Visibility.

Example:

true

company_id
string<uuid>

Optional company profile to ground the completion in, so the model has that company's context (industry, jurisdiction, regulations, risk posture). Discover company profiles via GET /company-profiles.

The company is fixed for the life of a chat. On a new chat, supply this to target a specific company (the only way to ground against a particular one in a multi-company organization); when omitted, a company is auto-resolved: user-scoped keys use the caller's active (default) company, and org-scoped keys use the organization's sole company, or none when there are several.

When continuing a chat with chat_id, omit this to reuse the chat's company. You may echo the same company_id, but a different one is rejected with 409 (start a new chat to use a different company).

Example:

"d4c3b2a1-f6e5-0987-dcba-fedcba098765"

vault_id
string<uuid>

Optional Contract Intelligence vault to ground the completion in, so the model can query that vault's documents and fields. Copy the vault ID from the GC AI web app.

Authorization: User-scoped keys need the Vault Chat permission, Contract Intelligence access, and view access to the vault. Organization-scoped keys need the organization to have Contract Intelligence entitlement; they can attach any vault in the organization because organization keys have no user identity for per-vault access checks.

The vault is fixed for the life of a chat. When continuing with chat_id, omit this to reuse the chat's vault. You may echo the same vault_id, but a different one is rejected with 409 (start a new chat to use a different vault).

When also filing into a project (project_id) that is linked to a vault, vault_id must match that vault. A different one is rejected with 409; omit vault_id to use the project's vault.

Example:

"e5d4c3b2-a1f6-7890-bcde-f1234567890a"

Response

Job completed within the effective wait window

job_id
string<uuid>
required

Async job identifier

kind
enum<string>
required

Stable job kind for this endpoint

Available options:
chat/completions
status
enum<string>
required

Current job status

Available options:
pending,
running,
succeeded,
failed,
canceled
result
object | null
required

Completion payload when the job has succeeded

error
object | null
required

Failure payload when the job has failed

created_at
string
required

ISO 8601 creation timestamp

completed_at
string | null
required

ISO 8601 completion timestamp, or null when not terminal