OpenAI GPT-5.6 Sol/Terra/Luna — Astra details, GPT-5.6-Cyber launch, congressional investigation

OpenAI's GPT-5.6 family continues to dominate headlines. New Astra details reveal multi-agent long-horizon collaboration, solving unsolved math problems, 2x Sol size, and White House approval timeline. GPT-5.6-Cyber launched as a two-tier cybersecurity model for vetted defenders, finding real zero-days. House Democrats demand OpenAI and Anthropic CEOs testify over Hugging Face and Claude containment breaches — first formal investigation into security failures. Congress demanding transparency from Sam Altman.