Anthropic's Messages API now offers message threads in beta (header message-threads-2026-08-12), letting long conversations and agent loops keep conversation state server-side so each request sends only new messages, reducing request size and time to first token. Threads expire 5 minutes after the last request and are deleted within 1 hour of last use. The feature is available on the Claude API, Claude Platform on AWS, Claude Models on Google Cloud (Anthropic managed), and Claude in Microsoft Foundry.
Read the full story on platform.claude.com
What to doTry message threads by sending the message-threads-2026-08-12 beta header, and design for the 5-minute expiry and 1-hour deletion windows.
- Provider
- Anthropic
- Source
- platform.claude.com