Anthropic's capital efficiency in model training has been impressive. However, OpenAI's willingness to spend massively on compute could become a decisive advantage. As user demand outstrips supply, reliable service capacity—not just model quality—may become the key differentiator and competitive moat.

While high capex is often seen as a negative, for giants like Alphabet and Microsoft, it functions as a powerful moat in the AI race. The sheer scale of spending—tens of billions annually—is something most companies cannot afford, effectively limiting the field of viable competitors.

Cohere's co-founder explains that creating large language models is enormously resource-intensive and complex, requiring vast compute, data, and specialized talent working in unison. This high barrier to entry is why the foundational model space is concentrated among a few players, similar to the aerospace industry.

Escalating compute requirements for frontier models are creating a new market dynamic where access to the best AI becomes restricted and expensive. This shifts power to the labs that control these models, creating a "seller's market" where they act as "kingmakers," granting massive competitive advantages to the highest corporate bidders.

OpenAI's forecast of a $665 billion five-year cash burn, doubling previous estimates, reveals the true, escalating cost of the AI arms race. Staying at the frontier requires astronomical capital for training and inference, suggesting the barrier to entry for building foundational models is becoming insurmountable for all but a few players.

Despite massive investment, the race to build advanced AI models is narrowing to just three serious US competitors: OpenAI, Anthropic, and Google. Competitors like Meta and Elon Musk's xAI are falling behind due to internal chaos and strategic resets, concentrating power among a few key players.

OpenAI's aggressive partnerships for compute are designed to achieve "escape velocity." By locking up supply and talent, they are creating a capital barrier so high (~$150B in CapEx by 2030) that it becomes nearly impossible for any entity besides the largest hyperscalers to compete at scale.

Amazon, Google, Meta, and Microsoft are collectively spending $660 billion on AI infrastructure in one year. This sum, equivalent to building the US interstate system, creates a capital expenditure moat that no startup or smaller competitor can cross, cementing their dominance.

Alex Sacerdote argues the AI foundational model space is narrowing to an oligopoly of OpenAI, Anthropic, and Google, much like the cloud market consolidated around AWS, Azure, and GCP. This structure creates durable, profitable businesses for the winners.