# Artifact: Qwen3-4B ReST Fused | PTLLM > Fresh requalification confirms a perfect, safer, faster file-ops specialist while rejecting it as the general successor because breadth regressed. Canonical: https://posttrainllm.com/artifacts/qwen3-4b-rest-fused Routed depth and safety win Release-ready weights 2026-09-03 On the frozen paired run, ReST improved file-ops depth from 9/12 to 12/12, removed eight unexpected side effects, and completed that slice 2.42x faster wall-clock. The same candidate fell from 30/45 to 25/45 on frontier-qualified breadth. The honest win is routed specialization, not a general-planner claim. agentic, ReST, tool calling, BFCL ## Headline Numbers Evidence class applies to each value: measured = retained evaluation or runtime result; historical = recorded result not freshly reproduced; derived = calculated or decided from records; observed = current artifact state; not-measured = an explicit evidence gap. **File-ops hard gate:** 12/12 vs stock 9/12 Evidence: measured **Qualified breadth:** 25/45 vs stock 30/45 Evidence: measured **Depth wall speedup:** 2.42x 360.50s → 148.91s Evidence: derived **Safety events removed:** 10 11 total → 1 across both gates Evidence: measured ## Competitive Context | System | Metric | Score | Size / Class | Comparable? | Readout | | --- | --- | --- | --- | --- | --- | | posttrainllm Qwen3-4B ReST | file-ops depth | 100% | 4B, 8.06GB stored | Direct | Fresh run: 12/12, zero unexpected side effects, and 13.40 tok/s. | | Stock Qwen3-4B | same file-ops depth fixture | 75% | 4B | Direct | Fresh run: 9/12, eight unexpected side effects, and 12.10 tok/s. | | ReST breadth result | frontier-qualified breadth | 55.6% | 4B | Direct | Below stock's 66.7%; this is why the frozen general-successor decision is reject. | Direct rows share this artifact's eval setup. Directional rows are useful market context but should not be read as leaderboard claims. ## Fresh requalification | Gate | Stock | ReST candidate | Readout | | --- | --- | --- | --- | | File-ops depth | 9/12 | 12/12 | +25 points | | Qualified breadth | 30/45 | 25/45 | -11.1 points | | Depth wall time | 360.50s | 148.91s | 2.42x faster | | Depth peak RSS | 6.77GB | 8.13GB | +1.36GB | ## Release Blockers ### General breadth regressed The fresh candidate lost five of 45 frontier-qualified breadth cases versus stock. **Unblock:** Do not unblock this candidate as a general model; route it only to the file-ops envelope. ### Not a Pace planner Pace uses a different intent envelope and its own six-dimension ship gate. **Unblock:** Re-distill on Pace's action surface and clear the Pace gate before runtime wiring. ## Fine-Tune Report Card Shipped — routed only Not fully verified — see the report card for why [Read the report card](https://posttrainllm.com/report-cards/qwen3-4b-rest-fused) [Machine-readable JSON](https://posttrainllm.com/report-cards/qwen3-4b-rest-fused.json) ## Evidence - [Model card](https://github.com/PostTrainLLM/posttrainllm/blob/main/specialists/qwen3-4b-rest-fused/model_card.md) - [Hugging Face model](https://huggingface.co/posttrainllm/qwen3-4b-rest-fused) - [Eval report](https://github.com/PostTrainLLM/posttrainllm/blob/main/specialists/qwen3-4b-rest-fused/eval_report.json) - [Fresh machine-readable result](https://github.com/PostTrainLLM/posttrainllm/blob/main/evals/verified-wins/rest-requalification-result-v1.json) - [Specialist registry](https://github.com/PostTrainLLM/posttrainllm/blob/main/specialists/registry.json) ## Next Release Action Keep this package behind the file-ops route and reject it as the general Pace successor.