Cerebras Systems vs. Rigetti Computing: Is an AI or Quantum Computing Stock the Better Buy in 2026?

BigBear.ai (BBAI) and Nebius Group (NBIS) are two specialized AI stocks that investors are evaluating for potential inclusion in their portfolios ahead of 2026. While both companies operate within the artificial intelligence sector, they provide different services that cater to distinct market needs.

BigBear.ai specializes in decision intelligence and autonomy software, with a primary focus on the U.S. federal government market. The company operates under a land-and-expand model, initially deploying pilot projects before pursuing larger, long-term contracts. This strategy, although effective in securing government contracts, also introduces a layer of risk due to customer concentration.

In its fiscal year 2025 annual report, BigBear.ai acknowledged this risk factor, highlighting its reliance on a limited number of government clients.

Nebius Group, on the other hand, provides a full-stack infrastructure for AI training and deployment. The company's offerings are geared towards the global cloud infrastructure market. Nebius Group's business model involves supplying the necessary hardware and software platforms that enable AI development and application. By focusing on infrastructure, the company potentially mitigates some of the risks associated with government contract dependency that BigBear.ai faces.

Investors are faced with the decision of choosing between a software-focused government contractor like BigBear.ai or an infrastructure-heavy cloud provider such as Nebius Group. The choice between the two may depend on an investor's preference for working within the government sector versus the broader cloud infrastructure market.

Both companies offer unique avenues for exposure to the artificial intelligence boom, but understanding their respective business models and risk profiles is crucial for making an informed investment decision.