Goodfire's Silico platform reproduces RLFR training method using model internals

Goodfire announced a private beta of Silico, an LLM training platform, and published a post describing how it reproduces RLFR—a method developed by Goodfire that uses probes as reward signals for reinforcement learning (RL). The announcement prompted Twitter commentary claiming the technique implements what was called the "Most Forbidden Technique" in a classic LessWrong post on the risks of training signals that use model internals.