OpenAI Launches GPT-5.5 and GPT-5.5 Pro: First Model Classified 'High' Cybersecurity Risk Under Preparedness Framework — $5/M Input, 82.7% Terminal-Bench 2.0

OpenAI·high signal

OpenAI released GPT-5.5 on April 23 with GPT-5.5 Pro following for API on April 24. This is the first model OpenAI has classified as 'High' under its Preparedness Framework for cybersecurity capabilities. GPT-5.5 scores 82.7% on Terminal-Bench 2.0 for command-line tool use, with Pro showing large gains in business, legal, education, and data science. API pricing: $5/$30 per million tokens (standard), $30/$180 (Pro). Nearly 200 early-access partners tested before release.