Cerebras Systems vs. IonQ: Which Technology Stock Is a Better Buy in 2026?

Investors seeking exposure to next-generation computing often choose between the specialized hardware of Cerebras Systems (NASDAQ:CBRS) and the quantum potential of IonQ (NYSE:IONQ) when deciding which is the better buy.

Cerebras focuses on massive AI chips that dwarf traditional processors, while IonQ builds systems using individual atoms to perform calculations. Both companies aim to redefine computing speed, but they operate at different stages of commercial maturity and target distinct technical challenges within the broader technology landscape.

The case for Cerebras Systems

Cerebras Systems designs and sells AI compute systems within the semiconductor stocks space, built around its unique wafer-scale engine. It serves organizations in medical research and energy through on-premises sales and cloud-based inference access. The specialized nature of these massive chips often involves serving a limited number of high-value accounts.

In FY 2025, revenue reached approximately $510.0 million, representing a significant increase from nearly $290.3 million the previous year. This growth resulted in a net margin of approximately 46.6%, which measures how much revenue remains as profit after expenses. Net income for the period was roughly $237.8 million.

As of its December 2025 balance sheet, the current ratio is roughly 2.1x, meaning it has over twice as many short-term assets as liabilities. The debt-to-equity ratio is approximately -0.5x, indicating that total liabilities exceed shareholder equity. Free cash flow was nearly negative $392.8 million in FY 2025, representing the cash a company generates after accounting for capital expenditures.

The case for IonQ

IonQ provides quantum computing and networking infrastructure, utilizing trapped ions to solve complex problems. The company maintains commercial agreements with major cloud providers such as Amazon (NASDAQ:AMZN) and Microsoft (NASDAQ:MSFT). Management is actively working to expand its direct sales reach, though revenue concentration currently adds a layer of risk to the business.

In FY 2025, the company reported revenue of close to $130.0 million, a sharp jump from about $43.1 million in FY 2024. Despite this growth, it recorded a net loss of approximately $510.4 million, representing a net margin of nearly -392.6%, meaning expenses significantly exceed revenue as the company matures. The widening loss highlights the high research and development costs required to advance quantum hardware.

According to its December 2025 balance sheet, the current ratio is roughly 15.5x, reflecting a high amount of liquid assets relative to short-term obligations. The debt-to-equity ratio is approximately 0.0x, meaning the company carries almost no debt relative to its equity. Free cash flow for FY 2025 was nearly negative $299.6 million, as the business prioritizes technical development over immediate cash generation.

Risk profile comparison

Cerebras Systems faces risks related to the intense competition in the AI hardware market, where established rivals have larger budgets and broader distribution networks. The company also deals with significant supply chain complexity, as its unique wafer-scale chips require specialized manufacturing processes. Furthermore, the specialized nature of its hardware carries risks of volatile sales cycles if large enterprise customers delay technology investments.

IonQ operates as an early-stage company with a history of operating losses, facing significant challenges in scaling quantum technology. The business faces intense global competition while remaining dependent on third-party cloud providers for its concentrated revenue. Integration risks from acquisitions like SkyWater Technology also increase operational complexity and management burden.

Valuation comparison

Cerebras Systems appears more reasonably valued on a P/S ratio basis, while IonQ carries a higher premium despite its lack of a Forward P/E multiple.

Which stock would I buy in 2026?

I'd go with IonQ, though Cerebras has become a more interesting company than it was even a few months ago. Since its IPO, Cerebras has signed a $20 billion multi-year compute deal with OpenAI, launched a partnership with AWS, and positioned itself as an alternative to Nvidia for AI inference workloads. That is a remarkable amount of commercial momentum in a short period of time.

But the stock has been down significantly since its IPO. Customer concentration risk has shifted rather than disappeared, and the business is still burning through cash despite turning net income positive in 2025.

IonQ offers something different: a diversified and growing customer base across government, enterprise, and international markets, a backlog that grew more than 500% year over year, and semiconductor manufacturing capabilities added through the SkyWater acquisition that could accelerate its hardware roadmap.

Both companies are early-stage and speculative. But IonQ's commercial diversification makes it the more comfortable starting point for a patient investor right now.

Sara Appino has positions in Amazon and Nvidia. The Motley Fool has positions in and recommends Amazon, IonQ, Microsoft, and Nvidia. The Motley Fool has a disclosure policy.