curl -X POST 'https://api.openai.com/v1/organization/groups/group-id/users' \
  -H "Authorization: Bearer $OPENAI_ADMIN_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "user_id": "user-id"
}'

# POST /organization/groups/{group_id}/users (OpenAI API)
Base URL: https://api.openai.com/v1
Auth: Authorization; OpenAI admin key; required.
Request formats: application/json.
Last verified: 2026-10-20

> Add group user

## Critical Gotchas
* The Responses API is the primary interface for new text and tool workflows; Chat Completions remains a separate compatibility API.
* Audio transcription uploads use multipart form data rather than a JSON request body.

## cURL
curl -X POST 'https://api.openai.com/v1/organization/groups/group-id/users' \
  -H "Authorization: Bearer $OPENAI_ADMIN_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "user_id": "user-id"
}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| group_id | path | string | Yes | The ID of the group to update. |
| user_id | body | string | Yes | Identifier of the user to add to the group. |

## Response example
{"object":"group.user","user_id":"string","group_id":"string"}

---
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POST

POST /organization/groups/{group_id}/users — OpenAI API

OpenAI admin key (required); https://api.openai.com/v1

OpenAI API

Add group user

Base URL: https://api.openai.com/v1
Auth: Authorization: Bearer <OPENAI_API_KEY>
Last verified: 2026-10-20 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 203 tokens · Vary: Accept

Critical gotchas

The Responses API is the primary interface for new text and tool workflows; Chat Completions remains a separate compatibility API.

Audio transcription uploads use multipart form data rather than a JSON request body.

cURL

curl -X POST 'https://api.openai.com/v1/organization/groups/group-id/users' \  -H "Authorization: Bearer $OPENAI_ADMIN_KEY" \  -H 'Content-Type: application/json' \  -d '{  "user_id": "user-id"}'

Parameters

Name	In	Type	Required	Description
group_id	path	string	Yes	The ID of the group to update.
user_id	body	string	Yes	Identifier of the user to add to the group.

Response 200 OK

{
  "object": "group.user",
  "user_id": "string",
  "group_id": "string"
}

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