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Anthropic opens message threads for long-running Claude agents
Anthropic’s November 2 article says Messages API message threads are in public beta. Applications send only new messages and a prior response ID after the first turn; the thread expires after five minutes of inactivity. Claude still reads the full history, so token usage and standard pricing do not fall. Anthropic reports a 35% median time-to-first-token reduction for very long requests; that is a company benchmark.
Primary source · Anthropic · November 2, 2026
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