curl -X GET 'https://api.openai.com/v1/chat/completions/completion-id/messages?after=example-after&limit=20&order=asc' \
  -H "Authorization: Bearer $OPENAI_API_KEY"

# GET /chat/completions/{completion_id}/messages (OpenAI API)
Base URL: https://api.openai.com/v1
Auth: Authorization; OpenAI API key; required.
Last verified: 2026-10-20

> Get chat messages

## 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 GET 'https://api.openai.com/v1/chat/completions/completion-id/messages?after=example-after&limit=20&order=asc' \
  -H "Authorization: Bearer $OPENAI_API_KEY"

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| completion_id | path | string | Yes | The ID of the chat completion to retrieve messages from. |
| after | query | string | No | Identifier for the last message from the previous pagination request. |
| limit | query | integer | No | Number of messages to retrieve. |
| order | query | string | No | Sort order for messages by timestamp. Use `asc` for ascending order or `desc`... |

## Response example
{"object":"list","data":[{}]}

---
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GET

GET /chat/completions/{completion_id}/messages — OpenAI API

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

OpenAI API

Get chat messages

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
→ 241 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 GET 'https://api.openai.com/v1/chat/completions/completion-id/messages?after=example-after&limit=20&order=asc' \  -H "Authorization: Bearer $OPENAI_API_KEY"

Parameters

Name	In	Type	Required	Description
completion_id	path	string	Yes	The ID of the chat completion to retrieve messages from.
after	query	string	No	Identifier for the last message from the previous pagination request.
limit	query	integer	No	Number of messages to retrieve.
order	query	string	No	Sort order for messages by timestamp. Use `asc` for ascending order or `desc` for descending order. Defaults to `asc`.

Response 200 OK

{
  "object": "list",
  "data": [
    {
      "id": "string",
      "role": "user",
      "content": "string",
      "content_parts": [
        {
          "type": "text",
          "text": "string",
          "image_url": {
            "url": "[recursive or deeply nested schema]",
            "detail": "[recursive or deeply nested schema]"
          },
          "input_audio": {
            "data": "[recursive or deeply nested schema]",
            "format": "[recursive or deeply nested schema]"
          },
          "file": {
            "file_data": "[recursive or deeply nested schema]",
            "filename": "[recursive or deeply nested schema]",
            "file_id": "[recursive or deeply nested schema]"
          }
        }
      ],
      "name": "string"
    }
  ],
  "first_id": "string",
  "last_id": "string",
  "has_more": true
}

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