Foundational AI models will commoditize into a utility layer where companies buy "intelligence on the fly." The real, sustainable profit will be captured by application companies that leverage various models to solve specific business problems, as most enterprises lack the expertise to use raw models effectively.

The CEO of Mercor argues that defensibility in the AI application layer is incredibly difficult to build. As foundation models like Claude improve, they will natively absorb the functionality of vertical-specific applications (e.g., for law, finance), making the underlying model the true, defensible product.

The assumption that startups can build on frontier model APIs is temporary. Emad Mostaque predicts that once models are sufficiently capable, labs like OpenAI will cease API access and use their superior internal models to outcompete businesses in every sector, fulfilling their AGI mission.

The fear that large AI labs will dominate all software is overblown. The competitive landscape will likely mirror Google's history: winning in some verticals (Maps, Email) while losing in others (Social, Chat). Victory will be determined by superior team execution within each specific product category, not by the sheer power of the underlying foundation model.

OpenAI CEO Sam Altman now publicly hedges that winning requires the best models, product, *and* infrastructure. This marks a significant industry-wide shift away from the earlier belief that a sufficiently advanced model would make product differentiation irrelevant. The focus is now on the complete, cohesive user experience.

Similar to how blockchain protocols like Bitcoin and Ethereum accrued more value than the apps built on them, AI foundation models are getting 'fatter.' They are absorbing more capabilities, allowing users to perform complex tasks in a single step within the base model, reducing the need for specialized application-layer companies.

The enduring moat in the AI stack lies in what is hardest to replicate. Since building foundation models is significantly more difficult than building applications on top of them, the model layer is inherently more defensible and will naturally capture more value over time.

Unlike prior tech cycles with a clear direction, the AI wave has a deep divide. SaaS vendors see AI enhancing existing applications, while venture capitalists bet that AI models will subsume and replace the entire SaaS application layer, creating massive disruption.

Leading AI companies like Anthropic are positioning themselves as the infrastructure layer for intelligence, akin to how AWS provides infrastructure for computing. Their strategy is to partner with and enable existing SaaS companies, not to destroy them by competing directly at the application level.