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Anthropic launches Message Threads beta to cut latency in long-running agent sessions

This story is from 2026-11-02. It is preserved in the archive; the latest stories are on the live feed.

Anthropic released Message Threads in public beta on the Messages API on November 2, letting apps send only new messages after an initial full-conversation request, cutting time to first token by about 35% for 500k-1M token requests.

Read the full story at Anthropic (X) ↗

Timeline · 7 reports

  1. 2026-11-04 02:07 · r/ClaudeAI
    Anthropic shipped message threads (beta): Claude Code now sends only new messages per turn, about 35% lower time to first token on 500k to 1M token requests
  2. 2026-11-03 13:46 · The New Stack AI
    Anthropic speeds up Claude Code with message threads. But your token bill stays the same.
  3. 2026-11-03 12:35 · The Decoder
    Anthropic's Message Threads cut time to first token by 35 percent for long conversations
  4. 2026-11-03 07:28 · ZDNET AI
    Is Claude Code truly faster with message threads? I did the math on my logs
  5. 2026-11-03 02:27 · r/ClaudeAI
    Anthropic added “message threads” to the Messages API (public beta): send the conversation once, then only new messages. Already on by default in Claude Code
  6. 2026-11-02 19:27 · Anthropic (X)
    Message threads are now in public beta on the Messages API
  7. 2026-11-02 19:21 · Unite.AI
    Anthropic Launches Message Threads Beta for Long-Running Agents

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