Anthropic published a new feature on claude.com this week.
The feature is called message threads. It is live now in public beta on the Claude Platform.
Normal API calls work one way today. A program sends its whole conversation history with every single message. Long chats start to drag under that weight.
Message threads change the shape of that call. A program sends the full conversation just once. After that, it sends only the newest message plus one short ID.
Anthropic measured the gain on its longest chats, those between 500,000 and 1 million tokens. The median wait for a first reply dropped by about 35 percent. A token is a small chunk of text a model reads or writes.
A thread stays open for 5 minutes after its last message. Wait past that window, and the next call falls back to sending the whole history again.
Token billing stays exactly the same. Anthropic charges the same standard rates either way.
The feature already runs by default inside Claude Code, Anthropic's own coding tool. That is where the 35 percent figure comes from.
A Reddit poster named emarkosov broke the update down on r/ClaudeAI. The post pulled 11 comments. One reader asked whether the 5 minute limit gets in the way during slow tool calls.
Anthropic rolled the beta out across more than one cloud at once. It now runs on the Claude Platform, Amazon Web Services, Microsoft Foundry, and Google Cloud together.
Wikipedia's page on Anthropic drew 8,845 views on November 2 alone. That shows how closely people now track the company's engineering choices.
Long-running AI agents are the real target here. An agent that works for hours needs a fast reply on every single step. Shaving a third off that wait adds up fast across a long job.