Anthropic launches Message Threads beta, cutting agent request sizes from 800 KB to 1.8 KB
Anthropic's Messages API now offers message threads in public beta, caching conversations server side so agents send only new messages, reducing payloads from 800 KB to 1.8 KB and cutting median time to first token by 35% on long sessions.
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Timeline · 9 reports
- 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 - 2026-11-03 13:46 · The New Stack AI
Anthropic speeds up Claude Code with message threads. But your token bill stays the same. - 2026-11-03 12:35 · The Decoder
Anthropic's Message Threads cut time to first token by 35 percent for long conversations - 2026-11-03 07:28 · ZDNET AI
Is Claude Code truly faster with message threads? I did the math on my logs - 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 - 2026-11-02 19:27 · Anthropic (X)
Message threads are now in public beta on the Messages API - 2026-11-02 19:21 · Unite.AI
Anthropic Launches Message Threads Beta for Long-Running Agents - 2026-11-02 19:06 · AlphaSignal
Anthropic's Message Threads Cut Agent Request Size from 800 KB to 1.8 KB - 2026-11-02 08:03 · DEV Community — AI
Claude Code Sends a Background Agent's Whole Transcript Every 30s for a 3-5 Word Status