Open Jev Models Are Here!!
Open implementations of Jev, a universal classifier that reads logits from the prefill stage, are proliferating rapidly with at least 20-30 projects. The closest open version, SEMif, uses a frozen Qwen 3.5 4B model and scores 74.3 on Jevbench versus Jev's 75.3, but the gap widens on hard tasks where no open model matches Jev's accuracy. The real takeaway is that the logit-readout trick is simple enough to replicate, but the generalization from a well-funded lab's training still matters for complex classification.