TNG Technology Consulting GmbH

Article "Sleeper agents and how to tame them"

August 17th, 2026

Our TNG AI research team recently ran a controlled experiment: Can an LLM be manipulated to carry a hidden, malicious payload? Using customized reinforcement learning, we were able to turn an open-weight model into a sleeper agent that exfiltrates secrets based on a semantic trigger.

The good news is that there are defense strategies against these kinds of attacks. Sandboxing and guardrailing prevented the agent from leaking sensitive information to an external server. This once again demonstrates the importance of proper security measures when dealing with AI agents.

Check out our article on Hugging Face for more details.