curl -X POST 'https://api.openai.com/v1/live/sessions/session-id/fork' \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "transport": {
    "type": "webrtc",
    "sdp": "example-sdp"
  }
}'

# POST /live/sessions/{session_id}/fork (OpenAI API)
Base URL: https://api.openai.com/v1
Auth: Authorization; OpenAI API key; required.
Request formats: application/json.
Last verified: 2026-10-20

> Fork session

## 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/live/sessions/session-id/fork' \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "transport": {
    "type": "webrtc",
    "sdp": "example-sdp"
  }
}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| session_id | path | string | Yes | The ID of the stored Live session to fork. |
| transport | body | object | Yes | WebRTC transport carrying the offer SDP in a creation request or answer SDP i... |
| session | body | object | No | Optional overrides for a stored Live session. Omitted settings are inherited.... |

## Response example
{"session":{"id":"string"},"transport":{"type":"webrtc","sdp":"string"}}

---
Need an API key? Get one at https://platform.openai.com/api-keys

POST

POST /live/sessions/{session_id}/fork — OpenAI API

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

OpenAI API

Fork session

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
→ 245 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/live/sessions/session-id/fork' \  -H "Authorization: Bearer $OPENAI_API_KEY" \  -H 'Content-Type: application/json' \  -d '{  "transport": {    "type": "webrtc",    "sdp": "example-sdp"  }}'

Parameters

Name	In	Type	Required	Description
session_id	path	string	Yes	The ID of the stored Live session to fork.
session	body	object	No	Optional overrides for a stored Live session. Omitted settings are inherited. The model, voice, frontend instructions, and prior conversation come from the stored session. WebRTC negotiates its audio format; audio.format is only supported on WebSocket forks.
transport	body	object	Yes	WebRTC transport carrying the offer SDP in a creation request or answer SDP in its response.

Response 200 OK

{
  "session": {
    "id": "string"
  },
  "transport": {
    "type": "webrtc",
    "sdp": "string"
  }
}

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