WASHINGTON — A White House official said the U.S. government has finalized details for advanced artificial intelligence model tests, a concrete step toward deploying cutting-edge AI in public sector operations and establishing regulatory frameworks.

Microsoft rose 4.2 percent to $484.14 and Nvidia gained 2.7 percent to $206.17 on the news. The Nasdaq climbed 1.8 percent to 25,827.

The finalized testing protocols give AI developers a clearer roadmap for deploying models in sensitive government applications. Tests will focus on security, bias mitigation and performance benchmarks, giving companies with strong AI compliance capabilities a competitive edge in federal procurement.

Alphabet rose 3.7 percent to $369.19 and Amazon climbed 4.7 percent to $284.39, with both companies holding deep positions in cloud infrastructure and large language model development that make them credible beneficiaries of increased federal AI spending. Meta Platforms rose 5.9 percent to $589.64. Tesla gained 3.6 percent to $322.38, carried by the broader tech rally.

Microsoft and Nvidia stand out as the most direct winners. Microsoft's existing government contracts through Azure and its enterprise software footprint make it the likely lead vendor for AI integration across federal departments. Nvidia's GPU dominance is non-negotiable for any large-scale AI deployment — no credible alternative exists at scale for training and inference workloads. Both companies should see upward earnings revisions as federal contracts move from proposal to award.

The White House official said initial testing phases are expected to begin within three months. Results will inform procurement guidelines and set policy precedents for AI development across the United States. Watch for federal requests for proposals — those will be the first hard evidence of contract awards and the revenue attached to them.