The Golden Age of AI Applications
Market
CTO build-vs-buy / AI application-layer sourcing strategy
Trend
Tunguz argues the AI moat has shifted from the foundation model itself to the "harness" wrapped around it — citing Microsoft's Satya Nadella ecosystem thesis, the Fable retraction, and Salesforce's $3.6B acquisition of Fin as evidence that differentiation now lives in workflow integration and proprietary context, not raw model access.
Tech Highlight
The actionable primitive is distinguishing "leading" moats (technical differentiation that dissolves within a year as models commoditize) from "lagging" moats (scale, brand, embedded workflows built over years) — CTOs should direct engineering investment toward the latter.
6-Month Outlook
Watch for more $1B+ application-layer acquisitions following Salesforce/Fin, as platform vendors buy harness-layer differentiation rather than build it, and for "intelligence per dollar" framing showing up in vendor RFPs in place of raw model benchmarks.