---
license: other
tags: [stem-0, listening-checkpoint, not-a-release]
---
# stem-0-v4-20k — LISTENING CHECKPOINT ONLY

v0.4 r2 decoder at step 20,000. **Not a release candidate**: this run's training manifest
included the 40 validation tracks (builder defect, found 2026-08-21), so its validation numbers
are not held-out measurements. Kept for A/B listening against earlier checkpoints. The clean
run is v0.4 r3 (manifest 1b6778e6759da159).