Very interesting. I was checking WU this morning on the peachy-keen Lenovo AIO 9i the company sent last month. Seems there’s an update available for a local NPU focused language model called Phi Silica (see lead-in graphic). Seems it’s focused on handling SLMs (Small Language Models) on behalf of Windows 11. It drives the OS’s new “AI facilities,” such as Recall, Click-to-Do, and so forth. As MS updates Phi Silica for Copilot+ PCs, I decided to dig in and learn more… So I asked Copilot, and it told me a LOT.

After MS Updates Phi Silica for Copilot+ PCs, Then?

Turns out there’s a special Update History section for this kind of thing, as the lead-in graphic shows. it’s called “AI Component Updates” and it indicates that Phi Silica has already been updated twice on this machine.

Phi Silica is a small-language model (aka SLM) purpose built for Copilot+ PCs. It runs as well as it can on such a PC’s Neural Processing Unit (aka NPU). It lets such models execute locally without having to use a cloud-based back end to do the heavy lifting.

Here’s how Copilot itself describes Phi Silica: It’s “a 3.3 billion parameter model, derived from Phi-3-mini, optimized for speed, accuracy and low power usage.” It “runs directly on the Snapdragon X Series NPU” (and obviously also their AMD and Intel counterparts, because the AIO 9i is an Intel PC), ” enabling fast private and offline AI tasks.” Phi Silica is what’s behind Click-to-do, on-device rewrite and summarization in Word and Outlook, and Windows Recall.

What Can Users Do with Phi Silica?

Quite a lot, as it turns out. When I asked Copilot if I could use my source files for the hundreds of books and thousands of articles and stuff I’ve written as the base for my own SLM, it said “Sure.” Then it pointed to the GitHub-based, open-ource Phi Cookbook as a good place for me to get started. I’m not sure I’m ready to go there, but it’s nice to know that door is open on Copilot+ PCs to someone with the time, wit and energy to make such a thing happen.