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Anthropic launches Message Threads in public beta, cutting agent request payloads from 800 KB to 1.8 KB

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

Anthropic's Messages API now caches conversations server side, so agents send only new messages plus a response ID instead of the full history. Anthropic reports payload sizes dropping from 800 KB to 1.8 KB and median time to first token down 35% on long sessions.

Read the full story at Anthropic (X) ↗

Timeline · 6 reports

  1. 2026-11-03 13:46 · The New Stack AI
    Anthropic speeds up Claude Code with message threads. But your token bill stays the same.
  2. 2026-11-03 12:35 · The Decoder
    Anthropic's Message Threads cut time to first token by 35 percent for long conversations
  3. 2026-11-03 07:28 · ZDNET AI
    Is Claude Code truly faster with message threads? I did the math on my logs
  4. 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
  5. 2026-11-02 19:27 · Anthropic (X)
    Message threads are now in public beta on the Messages API
  6. 2026-11-02 19:06 · AlphaSignal
    Anthropic's Message Threads Cut Agent Request Size from 800 KB to 1.8 KB

More stories

  1. Claude Code and Codex workflows draw a wave of setup, security, and verification guides — Runway Research
  2. Anthropic reports 1,100% revenue surge and $895B compute commitments ahead of IPO — Reuters AI
  3. Cat Wu, product lead for Claude Code, leaves Anthropic — Business Insider AI
  4. Developers document lessons from running multiple Claude Code sessions in parallel — DEV Community — AI
  5. Revolut cuts AI coding costs by 90% by self-hosting open-weight GLM models — The Register AI/ML
  6. Anthropic launches Message Threads beta, cutting agent request sizes from 800 KB to 1.8 KB — Anthropic (X)
  7. Anthropic confirms new Claude Code limits to prevent game cloning — Engadget
  8. Anthropic discloses nearly $900 billion in planned spending ahead of IPO — Axios AI+

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