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Interesting that this seems to be the announcement of Anthropic's Copilot alternative:

> A private beta of the Claude 3.5 Sonnet's new Fast Edit Mode, optimized for text editing. This upcoming mode achieves unprecedented speed in transforming existing text, enabling near-instantaneous code refactoring and document editing at scale.

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Sounds a lot like existing Claude integration + Caching (as most queries rely on relatively static code context)

its a bit more than that, you can clearly see that the decoding speed is super fast

yeah that caught my eye too, looks to me like speculative editing (they mentioned that its faster to each its input) + prompt-caching it would literally build up on all the tech they have

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