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Fable 5.5 ... 🤯 Your AI agent has been sending the entire conversation history over and…

Fable 5.5 ... 🤯 Your AI agent has been sending the entire conversation history over and over again with every single…

This is a dev post classified by AGK Intelligence as AI dev tools (a launch), kept by the Dev Radar because it carries real work, not commentary.

Fable 5.5 ... 🤯 Your AI agent has been sending the entire conversation history over and over again with every single message, but Anthropic just changed that with Message Threads! Now it only needs to send the full conversation once, and after that it just sends what's new. Same token usage, same price, but around 35% less time waiting for the first token in massive Claude Code sessions with 500K to 1M tokens of context. This could make a huge difference for coding agents and long running projects, especially when you're working with hundreds of tool calls, How big do your agent conversations

Posted by Iam_ (3.4k followers) 1 h ago · 8 likes · 1.5k views · view the original post on X. Kept by the Dev Radar as AI dev tools.

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Every post is read and classified by AGK Intelligence: what it is, which market it belongs to, and whether the link is a real tool. 31.3k posts from 5k X accounts over the last 21 days, 9.1k tools, 12 markets. New posts are collected several times an hour and the full ranking is recomputed every hour — last update 2026-11-02 20:37 UTC. Full method.