OpenAI Grants U.S. Government Early Access to GPT-5.5

OpenAI provided the United States government with early access to its GPT-5.5 AI model for national security testing and evaluations. The company is collaborating with the Center for AI Standards and Innovation to test GPT-5.5 Cyber, a specialized model designed for cyber defenders. This initiative includes a partnership with the White House to create a responsible deployment strategy for federal, state, and local governments, as well as critical infrastructure operators.

These security measures follow the launch of OpenAI for Government and a prior contract with the U.S. Department of War for classified work. The collaboration aims to establish a playbook for distributing AI capabilities across government tiers and international ally networks to bolster AI resiliency.

Simultaneously, the company released GPT-5.5 Instant as the new default model for ChatGPT, replacing GPT-5.3 Instant. OpenAI reported a 52.5% reduction in hallucinated claims and a 37.3% decrease in inaccuracies. Benchmark tests showed performance gains in mathematics and multimodal reasoning. The update introduces enhanced personalization and memory source tools that allow users to manage the data influencing AI responses.