OpenAI's GPT-5.6 Sol Helps Uncover Critical PHP Flaw Affecting 70% of the Web

OpenAI's GPT-5.6 Sol and Google's Gemini 4 Argon have discovered a critical PHP vulnerability that has existed undetected for 14 years, affecting approximately 70% of internet websites. The discovery, disclosed on October 21, 2026, comes as OpenAI commits $1 billion to equip critical infrastructure defenders with AI-powered cybersecurity tools.