Broadcom’s $18 Billion OpenAI Deal Hits a Snag as Microsoft Balks at Chip Guarantees

Broadcom’s ambitions to cement its dominance in the custom AI chip market have run into an unexpected roadblock. The chipmaker’s high-stakes partnership with OpenAI, code-named “Project Nexus,” is stalling over financing terms that have exposed the immense capital demands of the artificial intelligence arms race.

The first phase of the project carries a price tag of $18 billion, with Broadcom contracted to deliver bespoke AI accelerators designed to help OpenAI wean itself off Nvidia’s hardware. But before production can begin, Broadcom’s management is demanding ironclad purchase commitments. The sticking point: Microsoft, which is expected to buy roughly 40 percent of the initial chip batch, has so far refused to provide those guarantees.

The software giant’s reluctance reflects a strategic pivot. Microsoft is increasingly licensing OpenAI’s technology on a non-exclusive basis, reducing its incentive to lock in massive hardware orders. For Broadcom, the standoff underscores the brutal economics of the AI infrastructure buildout. OpenAI is projected to burn through roughly $115 billion by 2029, and Broadcom has no intention of shouldering that financial risk alone.

A Stretched Valuation Meets Growing Uncertainty

The news has rattled investors. Broadcom’s shares shed about 4 percent over the past two sessions before recovering slightly to trade at €356.65. The stock remains up nearly 93 percent year-to-date, but the lofty gains have left it vulnerable. With a price-to-earnings ratio of 80—nearly double its historical average—the margin for error is razor thin. Strong quarterly results have been overshadowed by the project’s uncertainty.

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The valuation is even more striking when compared to the broader market. Broadcom’s P/E of 81 far exceeds the sector average of roughly 49, a premium that analysts warn is built on a narrow base. A handful of hyperscaler clients—Alphabet, Meta, Anthropic, and OpenAI—drive the bulk of the company’s AI revenue. Should any one of these giants pull back, the growth narrative would quickly unravel.

Insider Selling Paints a Cautious Picture

While institutional investors such as Fisher Asset Management have been adding to their positions, Broadcom’s own executives have been heading for the exits. Over the past three months, insiders sold shares worth more than $106 million, with not a single purchase recorded from the C-suite. The selling spree, coming at a time when the stock is near record highs, suggests that even those closest to the business see limited near-term upside.

The timing is awkward. Broadcom currently commands roughly 70 percent of the custom AI accelerator market, a position it has built by supplying tailored ASICs to the world’s largest tech companies. In the first fiscal quarter, AI revenue nearly doubled year-over-year, with sales of its proprietary XPU processors surging 140 percent. Management has set a target of more than $100 billion in AI chip revenue by 2027.

Competition Heats Up as Delivery Timeline Wavers

That ambitious forecast is now facing a dual threat. On one side, the delay at Project Nexus could push back the initial chip delivery, originally slated for the second half of 2026. On the other, competitors are circling. Marvell is aggressively expanding into custom silicon, reportedly working with Alphabet on new AI chips while already supplying Amazon’s Trainium and Microsoft’s Maia processors.

Broadcom at a turning point? This analysis reveals what investors need to know now.

Market researcher TrendForce expects ASIC sales to jump 45 percent this year, outpacing growth in traditional graphics processors. Counterpoint Research still predicts Broadcom will defend roughly 60 percent of the market by 2027, but the competitive landscape is clearly shifting.

For now, the market is watching the clock. Broadcom is scheduled to report second-quarter earnings in June, a report that will test whether the fundamental story can justify the stock’s stretched multiple. Until then, the fate of Project Nexus—and the $18 billion question of who bears the risk—hangs in the balance.

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