ReJev fine-tunes MiniCPM5-2B to lift decision accuracy to 80.50%

ReJev, an independent community project, applied LoRA post-training to OpenBMB's MiniCPM5-2B for bounded agent decisions: state, question, and candidate options yield one choice.

On its sealed 1,892-sample holdout, accuracy rose from 51.11% to 80.50% (+29.39 percentage points) with 0% invalid outputs, at about $5.31 in cumulative Modal billing including earlier experimental overhead.

The authors describe this as an early, task-specific result, not parity with Jev.