Anthropic launches Message Threads in public beta, cutting agent request payloads from 800 KB to 1.8 KB
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
- 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 19:06 · AlphaSignal
Anthropic's Message Threads Cut Agent Request Size from 800 KB to 1.8 KB