The most-downloaded open System One reproduction. Merged Qwen3.5 fine-tunes, trained on about 95 public decision sets, then calibration-aware RL and a rank-64 LoRA, that softmax letter logits at an answer slot.
Every file resolves through a stable path — /v1/models/mapika/decider/resolve/2026.09/<path> — while the object underneath is content-addressed and shared with every other version that holds the same bytes. API reference.