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AI infrastructure investing: Are custom AI chips the real bubble?

October 21, 2026 - 6 min

As spending on artificial intelligence (AI) infrastructure accelerates, major technology companies are investing heavily in custom AI chips to reduce reliance on scarce and expensive graphics processing units (GPUs). Yet the larger investment risk may not be AI spending itself. Instead, it may be the assumption that every proprietary chip architecture can achieve the scale and economics needed to justify current expectations.

The custom application-specific integrated circuit (ASIC) boom is attracting growing attention as AI infrastructure spending expands. The key question is whether hyperscaler bargaining power and NVIDIA's integrated computing architecture will support the broad success currently anticipated, or whether they could reshape the next phase of the market by narrowing the field of winners.

Key takeaways

  • Custom ASICs could ease near-term cost and supply challenges, but lasting value will depend on scale.
  • Hyperscalers may capture more value through purchasing power, supplier competition, and equity-linked agreements.
  • NVIDIA’s integrated hardware and software ecosystem may raise the hurdle for proprietary chip architectures.
  • AI infrastructure spending can keep growing even if fewer custom architectures justify continued investment.

Why AI infrastructure may not be the real bubble

Investors continue to debate whether the capital flowing into AI represents a bubble. We think that may be the wrong question. AI demand continues to grow, and returns on AI infrastructure may ultimately justify a much larger buildout. Instead, excess may be developing in one part of the ecosystem: the assumption that every major technology company needs its own semiconductor architecture.

Custom AI chips have proliferated across Google, Amazon, Microsoft, Meta, OpenAI, and other companies. Industry forecasts increasingly assume this growth will continue, with MediaTek estimating that the AI ASIC market could reach about $70 billion to $80 billion in 2027.

That outlook rests on two important assumptions. First, today’s period of architectural experimentation must become tomorrow’s permanent industry structure. Second, the semiconductor companies enabling those custom chips must retain enough of the economics to justify investor expectations.

Why custom AI chips emerged as a procurement strategy

The decision to develop custom silicon was rational. AI demand accelerated faster than semiconductor supply could respond. Leading GPUs were expensive, difficult to obtain, and concentrated around a dominant supplier. For hyperscalers spending tens of billions of dollars on infrastructure, an alternative offered lower costs, greater supply diversity, and negotiating leverage.

Viewed through this lens, custom silicon is as much a procurement strategy as a technology strategy. A custom ASIC does not need to replace NVIDIA to create value. It may only need to lower the cost of a particular workload or provide a credible alternative that improves procurement economics.

Some programs will clearly justify themselves. Amazon, for example, believes Trainium can generate substantial capital-spending savings at sufficient scale. The point is not that custom ASICs cannot work. It is that achieving those economics requires scale, utilization, and continued investment across successive generations.

The market may therefore be extrapolating a rational response to scarcity into a permanent industry structure in which every proprietary architecture reaches economic scale.

How the custom ASIC cycle could evolve
Custom ASIC Cycle
Custom ASIC Cycle

How hyperscalers may capture custom ASIC economics

The hyperscalers’ procurement strategy has not stopped with creating alternatives to NVIDIA. They are increasingly applying the same pressure to the companies enabling their custom chips.

Recent warrant agreements provide a visible example. AMD has granted equity warrants tied to large AI purchase commitments from Meta and OpenAI. Marvell has entered a similar structure with Google as part of a major custom-silicon relationship. The terms differ, but the economic principle is similar: When a hyperscaler creates enormous incremental revenue for a semiconductor supplier, it increasingly expects to participate in the resulting equity value.

This does not mean the chips are technologically weak. It means bargaining power may sit with the customer. A highly differentiated supplier normally captures value through price and margin; in these agreements, suppliers are willing to share value creation to secure volume.

That matters because custom ASIC forecasts are usually expressed in revenue, but revenue growth and economic value creation are not the same. Even if the custom ASIC market reaches $70 billion to $80 billion, hyperscalers may use their purchasing concentration to demand lower pricing, multiple suppliers, continuous cost reductions, and participation in supplier upside.

Custom ASICs were designed in part to reduce NVIDIA’s pricing power. The irony is that they may create an industry in which hyperscalers hold pricing power over custom ASIC suppliers.

Why NVIDIA’s AI architecture matters more than chips

Custom ASIC suppliers may therefore be surrendering economics to win hyperscaler volume just as the standardized merchant alternative becomes more valuable.

NVIDIA is no longer simply selling a GPU. Its platforms increasingly combine GPUs, central processing units (CPUs), networking, rack-scale infrastructure, and software into one computing architecture. Compute Unified Device Architecture may be the most important part of that advantage.

A proprietary accelerator must continuously support its own software, compilers, libraries, and engineering. NVIDIA benefits from a much broader ecosystem of researchers, model developers, infrastructure companies and independent developers working to improve performance on its platform. Innovation outside NVIDIA can therefore improve the economics of installed NVIDIA hardware long after the chip has been purchased.

Developments such as TileRT illustrate the point. Performance gains can increasingly come from software, kernels, scheduling, and model optimization without designing another accelerator. The hurdle for custom silicon is not simply whether an internal chip is cheaper or faster at launch. It is whether that advantage can survive what the broader software ecosystem discovers over the hardware’s useful life.

Scale in AI may therefore be measured not only by how many chips an architecture ships, but also by how many people are working to improve that architecture.

Elon Musk’s recent decision at SpaceX provides a real-world example. Musk has extensive experience developing proprietary AI silicon and a long history of vertical integration. Yet as SpaceX prepares for a major expansion in AI compute, Musk has said the company intends to build exclusively around NVIDIA’s Vera Rubin architecture.

The decision is notable because it comes from an organization with technical resources and incentive to pursue custom silicon.

NVIDIA may not even need custom ASICs to disappear. NVLink Fusion allows custom accelerators to operate within NVIDIA-based infrastructure. The eventual outcome could therefore be multiple chips operating within far fewer independent computing architectures.

How hyperscalers can benefit from AI chip competition

If custom silicon succeeds, hyperscalers can use their purchasing scale, multiple suppliers, and warrant structures to capture more of the economics. If returns on a proprietary AI chip architecture begin to fall, hyperscalers can:

  • Slow the development roadmap
  • Extend an existing chip generation
  • Narrow the chip to specific workloads
  • Shift incremental demand toward a standardized merchant platform

Proprietary architecture requires ongoing research and development, engineering, software, tape-outs, manufacturing commitments, and supporting infrastructure. The next phase of the AI investment cycle may not be about spending less on AI. It may be about generating more compute from every dollar invested.

That creates the possibility of an unusual divergence: Hyperscaler free cash flow could improve just as custom ASIC suppliers begin to disappoint.

AI may not be the bubble. The belief that every company needs its own AI chip might be.

What custom ASIC risks mean for AI investors

In our view, the investment risk is not that AI fails. Instead, it is that AI succeeds while the number of economically relevant architectures becomes more concentrated and hyperscalers capture a larger share of the economics.

The custom ASIC thesis therefore requires investors to be right twice: The architectures must reach scale, and the suppliers must retain the economics.

Some programs will succeed. Google may sustain TPU. Amazon may sustain Trainium. Other custom accelerators may prove valuable for specific workloads. But AI compute can grow dramatically without every proprietary architecture reaching scale, and custom ASIC revenue can grow without suppliers capturing the value implied by that growth.

Investors may not need AI demand to disappoint. They may only need to discover that far fewer AI chip architectures achieve economic scale than current expectations assume.

Investment ideas

Diversify beyond mega-cap AI

When market leadership is concentrated in a single theme, a traditional index allocation may not be providing the diversification investors expect.

The views and opinions are as of September 2026 and may change based on market and other conditions.

This material is provided for informational purposes only and should not be construed as investment advice. There can be no assurance that developments will transpire as forecasted. Actual results may vary.

This material is not intended to be a recommendation or investment advice; does not constitute a solicitation to buy, sell or hold a security or an investment strategy; and is not provided in a fiduciary capacity. The information provided does not take into account the specific objectives or circumstances of any particular investor or suggest any specific course of action. Investment decisions should be made based on an investor’s objectives and circumstances, and in consultation with his or her advisors.

All investing involves risk, including the risk of loss. Investment risk exists with equity, fixed income, and alternative investments. There is no assurance that any investment will meet its performance objectives or that losses will be avoided. Investors should fully understand the risks associated with any investment prior to investing.

Natixis Advisors, LLC provides discretionary advisory services through its division Natixis Investment Managers Solutions. Discretionary advisory services are generally provided with the assistance of model portfolio providers, some of which are affiliates of Natixis Investment Managers.

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