Paste a reasoning trace, pick a validated feature pack, see which SAE features fire per token and what mech-reward score the trace would earn.
Preview mode. The interactive backend will ship after Stage Gate 2 completes on Qwen3.6-35B-A3B. The feature IDs and labels below are real and pulled from qwen3.5-4b/reasoning_pack.json. Labels are illustrative; auto-interp via Neuronpedia is pending (72h SLA).