Doppel

Doppel's AI Defense System Uses GPT-5 and Reinforcement Fine-Tuning to Counter Deepfake Attacks

Doppel, a digital risk protection company, has deployed GPT-5 combined with reinforcement fine-tuning to detect and stop deepfake and impersonation attacks. The system reportedly cuts analyst workloads by 80% and reduces incident response times from hours to minutes. This represents a production deployment of GPT-5 in a cybersecurity context, showcasing enterprise use of frontier models for threat detection.