State offloads Claude as underpinning model in flagship StateChat

The State Department has shifted the model underpinning its internal chatbot, StateChat, from Anthropic’s Claude Sonnet 4.5 to OpenAI’s GPT-4.1, following President Donald Trump’s Feb. 27 directive that all government agencies take steps to shed Anthropic tools from their systems. 

An internal document obtained by Nextgov/FCW confirms that Anthropic’s software is no longer powering StateChat and that the change to a new LLM contractor has also impacted the data on the internal chatbot, as it has now been set back to data available as of May 2024.

The earlier version of StateChat, when powered by Claude, was trained on more recent data from June 2025, a source familiar with the situation told Nextgov/FCW. The person spoke on the condition of anonymity to provide details about the model’s training data.

State employees using a customGPT setup running on Claude were also asked ...