Senate staff are now officially authorized to use three major generative artificial intelligence tools for official business. In a memo distributed on Monday and obtained by Business Insider, the Chief Information Officer for the Senate Sergeant at Arms approved the deployment of OpenAI's ChatGPT Enterprise, Google Gemini, and Microsoft Copilot Chat. While reports indicate that Senate personnel had previously utilized AI tools unofficially for various tasks, this directive formalizes their use under strict security guidelines. The memo highlights Microsoft Copilot Chat as a primary tool due to its seamless integration with the Microsoft 365 environment already present on Senate computers. The approved platforms are designated for specific work-related functions, including drafting and editing documents, summarizing complex information, preparing talking points, and conducting research. Microsoft Copilot Chat operates within the secure Microsoft Government cloud and does not automatically access internal drives, emails, or shared folders; data is only processed if explicitly entered into a prompt by the user. Notably, the Senate did not include Anthropic's Claude in its initial list of approved tools. An internal Senate IT notice indicated that Claude remains under evaluation. This decision coincides with a broader political dispute between Anthropic and the Trump administration, which has ordered federal agencies to cease using Claude due to restrictions on its use for mass surveillance and autonomous weapons. While that executive order does not technically apply to the legislative branch, the House of Representatives has already authorized the use of all four major models, including Claude, for official duties. The authorization covers all Senate employees, with Microsoft Copilot Chat available immediately at no cost. The Senate will also provide one Generative AI license each for Google Workspace with Gemini Chat and OpenAI ChatGPT Enterprise, though specific licensing details for these two platforms will be communicated within the next thirty days. This move aligns with a growing sentiment among lawmakers regarding the utility of AI. Several senators have publicly expressed support for staff usage of these technologies for research and drafting purposes, with some offices already developing internal guidelines even before this formal approval. The deployment of these tools is governed by the Senate's existing AI Policy, which mandates adherence to applicable office-level guidelines and cybersecurity standards. The Sergeant at Arms office emphasizes that while these tools offer significant productivity benefits, they must be used responsibly to protect sensitive legislative data. Staff members are directed to complete specific training modules and can contact Technology Experience Partners for assistance with implementation or policy questions. This approval marks a significant step in modernizing congressional workflows, bridging the gap between unofficial experimentation and sanctioned operational use.