BigBear.ai vs. Cerebras Systems: Which Tech Stock Is a Better Buy in 2026?

As artificial intelligence moves from hype to hardware and software deployment, investors must decide where to allocate capital. Should you bet on BigBear.ai (NYSE:BBAI) or Cerebras Systems (NASDAQ:CBRS)?

BigBear.ai focuses on decision intelligence for government and commercial logistics, while Cerebras Systems builds massive wafer-scale processors for enterprise-level model training. Both companies operate in high-growth niches of the AI market. Still, they represent vastly different business models and risk profiles for investors seeking exposure to the next phase of computing.

The case for BigBear.ai

BigBear.ai sells mission-ready AI and decision intelligence solutions for logistics, autonomous systems, and cybersecurity. It serves the U.S. defense and intelligence community, as well as commercial clients in manufacturing, distribution, and healthcare. In its 2025 annual report, the company noted that customers contributing over 10% of revenue accounted for nearly 51% of total revenue. Customer concentration like this adds a layer of risk to the business.

In 2025, revenue reached nearly $128 million, down from $158 million in the prior year. The company reported a net loss of $294 million for the fiscal year, resulting in a net margin of -230 %. Net margin measures how much profit a company makes per dollar of revenue, and a negative figure indicates that spending exceeded earnings.

As of its June 2026 balance sheet, the current ratio was close to 5.7x, which indicates the ability to cover short-term debts with current assets. The debt-to-equity ratio is approximately 0.0x, indicating the company has no debt relative to shareholders' equity.

Free cash flow for the period was a negative $73 million, representing the cash remaining after paying for operations and capital expenditures.

The case for Cerebras Systems

Cerebras Systems designs massive AI compute systems and chips, such as the CS-3, designed to handle intensive training and inference workloads. It serves high-performance computing customers across North America, Asia, and Europe, competing among specialized semiconductor stocks. The company provides hardware to diverse sectors, including healthcare and energy, while maintaining relationships with several national research laboratories.

In 2025, revenue reached nearly $510 million, representing 76% growth over the previous year. The company reported net income of $238 million for the period. This resulted in a net margin of close to 47%, the percentage of revenue retained as profit after all costs are paid.

As of its June 2026 balance sheet, the current ratio is approximately 5.8x, indicating a healthy cushion to meet short-term financial obligations. The debt-to-equity ratio was roughly 0.1x, indicating that total liabilities exceed shareholders' equity.

Free cash flow for the trailing-12-month period as of Q2 2026 was a negative $680 million, which represents the cash remaining from operations after accounting for capital expenditures.

Risk profile comparison

BigBear.ai faces significant risks, including a material class action lawsuit related to disclosed accounting errors and delays in regulatory filings. Its revenue concentration is high, and government contracts can be terminated unilaterally by the customer. The company has a history of net losses and recently reported significant non-cash impairment charges on its assets.

Cerebras Systems operates in a highly competitive market against other semiconductor companies. Maintaining technological leadership in the chip industry requires immense capital and continuous innovation to avoid becoming obsolete. The company must also manage the complexities of scaling its hardware production to meet global demand from enterprise and government clients.

Valuation comparison

Cerebras Systems carries a significantly higher P/S ratio than its peer, while BigBear.ai lacks a Forward P/E ratio due to its recent net losses.

Valuation metrics sourced from Financial Modeling Prep (FMP) and may differ from other data providers.

Which stock would I buy in 2026?

I would invest in Cerebras Systems over BigBear.ai. Cerebras is demonstrating much stronger and more consistent growth for its technology, indicating a larger addressable market. BigBear is promising but has struggled to achieve steady, meaningful revenue growth that would justify a long-term investment in the stock.

Cerebras has continued to grow at high rates in 2026, with second-quarter revenue up 74% year over year. This indicates significant upside potential for growing sales of its inference services. Management expects core revenue to more than triple in 2027, with continued growth in the coming years.

Meanwhile, BigBear's revenue grew 13% year over year in Q2, and the backlog grew 9%. The company signed 20 new contracts last quarter. Increasing defense spending on drones and other systems is a catalyst for the company's long-term growth. But the company's inconsistent quarterly revenue in recent years makes this more of a speculative play compared with the consistent growth Cerebras is seeing.

John Ballard has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.