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Overview Models Agents Tools Audio & voice Production API reference

Create a conversation

POST
/conversations

Create a conversation.

Create a conversation

curl https://api.openai.com/v1/conversations \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "metadata": {"topic": "demo"},
    "items": [
      {
        "type": "message",
        "role": "user",
        "content": "Hello!"
      }
    ]
  }'
Response example
{
  "id": "conv_123",
  "object": "conversation",
  "created_at": 1741900000,
  "metadata": {"topic": "demo"}
}
Body Parameters
JSON
items: optional array of EasyInputMessage { content, role, phase, type } or Message { content, role, status, type } or ResponseOutputMessage { id, content, role, 3 more } or 30 more or null

Initial items to include in the conversation context. You may add up to 20 items at a time.

maxItems20
metadata: optional Metadata or null

Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard.

Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters.

Returns
Conversation object { id, created_at, metadata, object }
Returns Examples
Response example
{
  "id": "conv_123",
  "object": "conversation",
  "created_at": 1741900000,
  "metadata": {"topic": "demo"}
}