# Anthropic's Messages API adds public beta message threads with server-side caching

> Original title: Message threads are now in public beta on the Messages API.

- Source: ClaudeDevs
- Published: 2026-11-02T19:06:08.000Z
- Bad Influence: https://badinfluence.news/items/ovbnahxp0z6ay9hushjtthy9r
- Original: https://x.com/ClaudeDevs/status/2117332449382510884

## Summary

Anthropic says message threads are now in public beta on the Messages API. The API caches conversations on the server between turns, so developers send only new messages plus the previous message ID instead of the full conversation, and Claude responds sooner.

## Post

Message threads are now in public beta on the Messages API.

The API caches your conversation on the server between turns, so instead of resending the full conversation, you send only new messages and the previous message ID, and Claude starts responding sooner.

[Video](https://badinfluence.news/api/img-proxy?u=https%3A%2F%2Fpbs.twimg.com%2Famplify_video_thumb%2F2117332353785704449%2Fimg%2Fp7_rHqaEU7-HLGfG.jpg&mode=thumb&exp=1793836800&sig=376dff3acf5b01e9)