---
title: "Changes to Send Message (Async)"
method: POST
path: "/chats/{chatId}/messages/async"
---

# Changes to Send Message (Async)

`POST /chats/{chatId}/messages/async`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 4 of 48 revisions.

- **2026-10-21** `467d24b4c224`: 13 breaking, 5 info
- **2026-10-08** `cca16477343a`: 6 info
- **2026-08-27** `3cf5debd6cf4`: 1 breaking, 3 warning, 5 info
- **2026-07-30** `da68370a2aea`: 1 info

## Changes

- **2026-10-21** `467d24b4c224`: 13 breaking, 5 info
  - removed the enum value `v0-max` of the request property `modelConfiguration/modelId` (media type: application/json)
  - removed the enum value `v0-max` of the request property `modelConfiguration/modelId` (media type: application/x-www-form-urlencoded)
  - removed the enum value `v0-max` of the request property `modelConfiguration/modelId` (media type: multipart/form-data)
  - removed the enum value `v0-max-fast` of the request property `modelConfiguration/modelId` (media type: application/json)
  - removed the enum value `v0-max-fast` of the request property `modelConfiguration/modelId` (media type: application/x-www-form-urlencoded)
  - removed the enum value `v0-max-fast` of the request property `modelConfiguration/modelId` (media type: multipart/form-data)
  - removed the enum value `v0-mini` of the request property `modelConfiguration/modelId` (media type: application/json)
  - removed the enum value `v0-mini` of the request property `modelConfiguration/modelId` (media type: application/x-www-form-urlencoded)
  - removed the enum value `v0-mini` of the request property `modelConfiguration/modelId` (media type: multipart/form-data)
  - removed the enum value `v0-pro` of the request property `modelConfiguration/modelId` (media type: application/json)
  - removed the enum value `v0-pro` of the request property `modelConfiguration/modelId` (media type: application/x-www-form-urlencoded)
  - removed the enum value `v0-pro` of the request property `modelConfiguration/modelId` (media type: multipart/form-data)
  - the `modelConfiguration/modelId` request property type changed from `string` to no type (media type: application/json)
  - added `subschema #1, subschema #2` to the `modelConfiguration/modelId` request property `anyOf` list (media type: application/json)
  - added `subschema #1, subschema #2` to the `modelConfiguration/modelId` request property `anyOf` list (media type: application/x-www-form-urlencoded)
  - added `subschema #1, subschema #2` to the `modelConfiguration/modelId` request property `anyOf` list (media type: multipart/form-data)
  - the `modelConfiguration/modelId` request property type was generalized from `string` to no type (media type: application/x-www-form-urlencoded)
  - the `modelConfiguration/modelId` request property type was generalized from `string` to no type (media type: multipart/form-data)
- **2026-10-08** `cca16477343a`: 6 info
  - added the new optional request property `designMode` (media type: application/json)
  - added the new optional request property `designMode` (media type: application/x-www-form-urlencoded)
  - added the new optional request property `designMode` (media type: multipart/form-data)
  - the request property `message` became optional (media type: application/json)
  - the request property `message` became optional (media type: application/x-www-form-urlencoded)
  - the request property `message` became optional (media type: multipart/form-data)
- **2026-08-27** `3cf5debd6cf4`: 1 breaking, 3 warning, 5 info
  - the `attachments/items/` request property type changed from `object` to no type (media type: application/json)
  - removed the request property `attachments/items/url` (media type: application/json)
  - removed the request property `attachments/items/url` (media type: application/x-www-form-urlencoded)
  - removed the request property `attachments/items/url` (media type: multipart/form-data)
  - added `subschema #1, subschema #2` to the `attachments/items/` request property `anyOf` list (media type: application/json)
  - added `subschema #1, subschema #2` to the `attachments/items/` request property `anyOf` list (media type: application/x-www-form-urlencoded)
  - added `subschema #1, subschema #2` to the `attachments/items/` request property `anyOf` list (media type: multipart/form-data)
  - the `attachments/items/` request property type was generalized from `object` to no type (media type: application/x-www-form-urlencoded)
  - the `attachments/items/` request property type was generalized from `object` to no type (media type: multipart/form-data)
- **2026-07-30** `da68370a2aea`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/vercel/apis/v0-platform-api-beta/docs/chats/:chatId/messages/async/post.md) - [API](https://skmtc.dev/vercel/apis/v0-platform-api-beta.md) - [Page](https://skmtc.dev/vercel/apis/v0-platform-api-beta/changes/chats/:chatId/messages/async/post)