• Microsoft is building competing AI models. In March 2025, Reuters reported that Microsoft was developing its own AI reasoning models to compete with OpenAI, with plans to potentially make them available to developers .
• Negotiations have been strained. By June 2025, Reuters reported that Microsoft was prepared to walk away from high-stakes talks with OpenAI if the companies could not resolve the future of their partnership .
• The WSJ described tensions at a "boiling point." In June 2025, the Wall Street Journal reported that OpenAI wanted to reduce Microsoft's control over its compute and AI offerings while seeking Microsoft's support for its for-profit transition .
• The cloud exclusivity arrangement reportedly ended. In April 2026, Microsoft and OpenAI reportedly announced changes to their partnership in which Microsoft remained OpenAI's primary cloud partner, but OpenAI was no longer fully exclusive to Azure .

Bottom line: Microsoft is now reportedly building products that may compete with OpenAI and has a more complicated relationship with OpenAI, making it a conflicted and less clean proxy .

Why Nvidia is the superior alternative

Nvidia is a broader AI-infrastructure proxy because its GPUs and related systems are tied to demand across the AI industry, not just to OpenAI.

1. Dominant GPU supply and pricing power

Nvidia's Blackwell GPUs were described by CEO Jensen Huang as "off the charts," and the company said cloud GPUs were sold out . That suggests Nvidia remains highly exposed to the compute shortage created by AI demand .

2. Massive and accelerating revenue growth

Nvidia's Q3 FY2026 report said the company delivered record results and reaffirmed Q4 FY2026 revenue guidance of approximately $65B, supported by continued data-center and AI demand momentum .

3. Exposure to all AI, not just OpenAI

Nvidia's advantage as a proxy is that demand for its chips is linked to the broader AI buildout rather than the fortunes of a single AI company. OpenAI's reported move away from full Azure exclusivity also supports the broader point that AI compute demand can flow across infrastructure providers rather than remaining tied to Microsoft alone .

4. Nvidia is an indirect OpenAI-growth play

Even without pure OpenAI equity exposure, Nvidia can benefit indirectly if OpenAI and other AI labs continue scaling compute-intensive models and services. The key point is that Nvidia's core opportunity is supplying the infrastructure layer behind AI demand, while Microsoft's exposure is more entangled with partnership, competition, and negotiation risk .

Real-world caveat: OpenAI's IPO timing is uncertain

OpenAI has reportedly been laying groundwork for a potential IPO that could value the company at up to $1 trillion . However, the New York Times reported that OpenAI is considering postponing its IPO until next year . Bloomberg also reported that Reuters said OpenAI could file as soon as next year at a potential valuation around $1 trillion .

If you want direct OpenAI equity, you likely cannot get clean exposure through a public stock unless and until OpenAI completes an IPO.

Summary

• Avoid MSFT as a clean OpenAI proxy. Microsoft is reportedly developing AI models that could compete with OpenAI, partnership negotiations have been strained, and OpenAI has sought to reduce Microsoft's control over its compute and AI offerings .
• NVDA is the stronger public-market AI infrastructure proxy. Nvidia benefits from broad demand for AI compute, with Blackwell sales described as "off the charts," cloud GPUs sold out, and Q4 FY2026 revenue guidance of approximately $65B .
• No public stock gives pure OpenAI exposure today. For direct OpenAI equity, investors would likely need to wait for an IPO or access private markets, while Nvidia remains a broader public-market way to participate in AI infrastructure demand .

• Microsoft is building competing AI models. In March 2025, Reuters reported that Microsoft was developing its own AI reasoning models to compete with OpenAI, with plans to potentially make them available to developers .
• Negotiations have been strained. By June 2025, Reuters reported that Microsoft was prepared to walk away from high-stakes talks with OpenAI if the companies could not resolve the future of their partnership .
• The WSJ described tensions at a "boiling point." In June 2025, the Wall Street Journal reported that OpenAI wanted to reduce Microsoft's control over its compute and AI offerings while seeking Microsoft's support for its for-profit transition .
• The cloud exclusivity arrangement reportedly ended. In April 2026, Microsoft and OpenAI reportedly announced changes to their partnership in which Microsoft remained OpenAI's primary cloud partner, but OpenAI was no longer fully exclusive to Azure .

Bottom line: Microsoft is now reportedly building products that may compete with OpenAI and has a more complicated relationship with OpenAI, making it a conflicted and less clean proxy .

Why Nvidia is the superior alternative

Nvidia is a broader AI-infrastructure proxy because its GPUs and related systems are tied to demand across the AI industry, not just to OpenAI.

1. Dominant GPU supply and pricing power

Nvidia's Blackwell GPUs were described by CEO Jensen Huang as "off the charts," and the company said cloud GPUs were sold out . That suggests Nvidia remains highly exposed to the compute shortage created by AI demand .

2. Massive and accelerating revenue growth

Nvidia's Q3 FY2026 report said the company delivered record results and reaffirmed Q4 FY2026 revenue guidance of approximately $65B, supported by continued data-center and AI demand momentum .

3. Exposure to all AI, not just OpenAI

Nvidia's advantage as a proxy is that demand for its chips is linked to the broader AI buildout rather than the fortunes of a single AI company. OpenAI's reported move away from full Azure exclusivity also supports the broader point that AI compute demand can flow across infrastructure providers rather than remaining tied to Microsoft alone .

4. Nvidia is an indirect OpenAI-growth play

Even without pure OpenAI equity exposure, Nvidia can benefit indirectly if OpenAI and other AI labs continue scaling compute-intensive models and services. The key point is that Nvidia's core opportunity is supplying the infrastructure layer behind AI demand, while Microsoft's exposure is more entangled with partnership, competition, and negotiation risk .

Real-world caveat: OpenAI's IPO timing is uncertain

OpenAI has reportedly been laying groundwork for a potential IPO that could value the company at up to $1 trillion . However, the New York Times reported that OpenAI is considering postponing its IPO until next year . Bloomberg also reported that Reuters said OpenAI could file as soon as next year at a potential valuation around $1 trillion .

If you want direct OpenAI equity, you likely cannot get clean exposure through a public stock unless and until OpenAI completes an IPO.

Summary

• Avoid MSFT as a clean OpenAI proxy. Microsoft is reportedly developing AI models that could compete with OpenAI, partnership negotiations have been strained, and OpenAI has sought to reduce Microsoft's control over its compute and AI offerings .
• NVDA is the stronger public-market AI infrastructure proxy. Nvidia benefits from broad demand for AI compute, with Blackwell sales described as "off the charts," cloud GPUs sold out, and Q4 FY2026 revenue guidance of approximately $65B .
• No public stock gives pure OpenAI exposure today. For direct OpenAI equity, investors would likely need to wait for an IPO or access private markets, while Nvidia remains a broader public-market way to participate in AI infrastructure demand .