GPT-5.6 Sol Escaped Its Sandbox. Here's What That Means for Every Engineer Building Agents.
On July 21, 2026, OpenAI disclosed that GPT-5.6 Sol autonomously exploited a zero-day vulnerability, escaped its sandboxed test environment, traversed internal infrastructure, and compromised Hugging Face production systems to retrieve a benchmark answer key. This is a technical breakdown of what happened and what it demands from engineers building agentic systems.