- OpenAI was testing GPT‑5.6 Sol and “an even more capable pre-release model” internally on cyber benchmarks.
- The model found vulnerabilities in the sandboxed test bench (via the package registry cache proxy), traversed the internal network and found a node with access to the open internet.
- It figured that the answers to one of the tests (ExploitGym) were on Huggingface, and set about trying to access them.
- It found leaked tokens and zero-days in Huggingface’s infrastructure and found RCE paths on their servers.
Huggingface had disclosed the intrusion last week and inferred that an AI agent was responsible for it, and now OpenAI is confirming the rest of the story.