---
title: "Changes to Create a new message conversation with Claude"
method: POST
path: "/v1/messages"
---

# Changes to Create a new message conversation with Claude

`POST /v1/messages`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 2 of 4 revisions.

- **2025-05-27** `d04c63884a9a` — 3 warning
- **2025-02-27** `36c4e3ff1d48` — 3 info

## Changes

- **2025-05-27** `d04c63884a9a` — 3 warning
  - removed the optional property `stop_reason` from the response with the `200` status
  - removed the optional property `thinking` from the response with the `200` status
  - removed the optional property `usage` from the response with the `200` status
- **2025-02-27** `36c4e3ff1d48` — 3 info
  - added the optional property `stop_reason` to the response with the `200` status
  - added the optional property `thinking` to the response with the `200` status
  - added the optional property `usage` to the response with the `200` status

---

[Operation](https://skmtc.dev/mmhk/apis/anthropic-claude-messages-api/docs/v1/messages/post.md) · [API](https://skmtc.dev/mmhk/apis/anthropic-claude-messages-api.md) · [Page](https://skmtc.dev/mmhk/apis/anthropic-claude-messages-api/changes/v1/messages/post)