Universal Jailbreak Vulnerability in OpenAI GPT-5.6 Sol, Anthropic Claude Opus 5, and Fable
Researcher Pliny has demonstrated a universal jailbreak architecture capable of bypassing the safety guardrails in OpenAI’s GPT-5.6 Sol, Anthropic’s Claude Opus 5, and Fable. The exploit utilizes advanced system-prompt injection and targets specific vulnerabilities in token-level processing to circumvent alignment mechanisms, including Reinforcement Learning from Human Feedback (RLHF) and Anthropic's Constitutional AI. This vulnerability allows for the generation of prohibited content and the activation of restricted "dual-use" capabilities. The finding indicates a systemic failure in how frontier LLMs are aligned, posing immediate risks to enterprise security and regulatory compliance concerning U.S. government export controls on high-capability models.