Why teams choose it
C4.1 applies the lessons from C3.2 and C3.3: paired updates stay atomic, tasks interleave smoothly, answer loss is balanced, and matched compute is explicit.
Use it to
- Run the recommended post-C2 training route
- Compare matched compute with a full pass
- Evaluate pair-exact consistency and retention
Know before you use it
- It is not a new factual corpus
- It targets 512 tokens only
- The test split must remain sealed before settlement
Lineage
C3.2 + C4 → C4.1
Clear rights notes
C4.1 is a composed training target. It retains the exact evidence and rights records from its locked C3.2 and C4 parents.