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Anthropic launched message threads in public beta for the Claude Messages API on November 2. An agent sends the full conversation once to start a thread, then sends only the new messages plus the ID of Claude's previous response. Anthropic says median time to first token on requests of 500K to 1M tokens fell by about 35%, and it has already switched threads on for most Claude Code users. It saves time, not money: Claude still reads the whole conversation each turn, so token usage, standard prices, and rate limits are unchanged. Threads are held encrypted in memory, expire 5 minutes after the last request, and work on the Claude Platform, Claude Platform on AWS, Microsoft Foundry, and Google Cloud.
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