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PART ONE — The Ground Shifts
Chapter 1

The Winter Something Changed

Page 1 · December 2025
Phase Transition
Phase Transition

In the first week of December 2025, a Google principal engineer sat down with Claude Code and described, in plain English, a problem her team had just spent the past year trying to solve.

Three paragraphs. A brief description of the problem with “no real details,” she said, because she couldn’t share anything proprietary, especially not on a competitor’s platform.

One hour later, Claude had produced a working prototype of her team's system. It wasn’t perfect, but for what it was – toying around with a system, just to see what it could produce – it was stunning.

She posted about it publicly.

“I am not joking,” she wrote on X, “and this isn’t funny.”

Anyone working on AI systems in late 2025 could relate to the whiplash she felt. In Slack channels, Reddit threads,

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