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Opus 5.5 Fast Mode Leaves Preview: 2x the Price, and a Speed Switch Misses the Cache

This story is from 2026-10-15. It is preserved in the archive; the latest stories are on the live feed.

Book: System Design Pocket Guide: Fundamentals The series: Pocket Guides for Developers — 8 short books on agents, RAG, prompts, observability, events, databases and system design — the whole series My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI codin…

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  1. 2026-10-15 22:01 · DEV Community — AI
    Opus 5.5 Fast Mode Leaves Preview: 2x the Price, and a Speed Switch Misses the Cache

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