Jev as a judge vs. LLM as a judge:
Same 100 agent trajectories. Two evaluators.
- Jev: 13.5 seconds, $0.001912
- GPT-5.5: 120.8 seconds, $0.419130
Jev was roughly 9× faster and 219× cheaper in this run.
A general-purpose LLM generates its judgment token by token. Jev returns focused, typed judgments and probabilities against defined criteria.
The video shows the comparison live, with a score for every trajectory.
For another way to use Jev, the guide below walks through pairing it with Opus to cut token usage by 90%.