Why teams choose it
C4.2 removes visible task boilerplate without changing the facts, splits, schedule, tokenizer, or compute budget. The model sees natural text while the trainer receives exact structured targets.
Use it to
- Train without serializer markers
- Keep answer spans and masks outside model text
- Run the matched C4.1 compute plan
Know before you use it
- It adds no new factual coverage
- It targets ZERO.5 at 512 tokens
- Its test content stays sealed and hash-only
Lineage
C4.1 → C4.2
Clear rights notes
C4.2 changes representation only. It inherits the exact evidence and rights chain from locked C4.1, C3.2, C4, and their pinned sources.