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README.md

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+---
+license: cc-by-sa-4.0
+task_categories:
+  - question-answering
+  - text-generation
+language:
+  - en
+tags:
+  - benchmark
+  - professional
+  - expert
+  - reasoning
+  - law
+  - medicine
+  - finance
+  - cybersecurity
+  - engineering
+  - llm-evaluation
+  - multiple-choice
+size_categories:
+  - 1K<n<10K
+---
+
+# ProBench
+
+A 4-choice multiple-choice benchmark of **529 expert-level questions** across five professional domains, sourced entirely from Stack Exchange communities (CC-BY-SA 4.0). Designed to evaluate LLMs where standard benchmarks (MMLU, HumanEval, HellaSwag) are now saturated above 90%.
+
+## Why ProBench?
+
+| Benchmark | Frontier model score | Status |
+|---|---|---|
+| MMLU | >90% | Saturated |
+| HellaSwag | >95% | Saturated |
+| HumanEval | >90% | Saturated |
+| **ProBench** | TBD | Active |
+
+Questions are sourced from real professional practitioners. Correct answers are community-verified (Stack Exchange accepted answers with high vote scores). Distractors are real expert-written text from the same domain — not synthetically generated.
+
+## Dataset Structure
+
+### Splits
+
+| Split | Count |
+|---|---|
+| train | 370 |
+| validation | 79 |
+| test | 80 |
+| **Total** | **529** |
+
+### By Domain
+
+| Domain | Source Community | Items |
+|---|---|---|
+| Cybersecurity | security.stackexchange.com | 148 |
+| Law | law.stackexchange.com | 121 |
+| Medicine | medicalsciences.stackexchange.com | 63 |
+| Engineering | engineering.stackexchange.com | 113 |
+| Finance | quant.stackexchange.com | 84 |
+
+### Record Format
+
+```json
+{
+  "id": "cybersecurity_29988",
+  "domain": "cybersecurity",
+  "question_title": "What is certificate pinning?",
+  "question_body": "I've recently seen ...",
+  "question_score": 373,
+  "question_tags": ["tls", "certificates", "public-key-infrastructure"],
+  "choices": {
+    "A": "You can roll your own, but you probably will make a major security...",
+    "B": "Software is too complex. This is by far the most important factor...",
+    "C": "The known_hosts file lets the client authenticate the server...",
+    "D": "Typically certificates are validated by checking the signature hierarchy..."
+  },
+  "answer": "D",
+  "distractor_source": "same_domain_answer_pool",
+  "source": "stackexchange",
+  "license": "CC-BY-SA 4.0",
+  "url": "https://security.stackexchange.com/questions/29988/..."
+}
+```
+
+## Evaluation
+
+Evaluation is exact-match (0 or 1 per question) — fully automated, no human judge required.
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("lin99/ProBench", split="test")
+
+def evaluate(model, dataset):
+    correct = 0
+    for row in dataset:
+        prompt = f"""Domain: {row['domain']}
+
+Question: {row['question_title']}
+
+{row['question_body']}
+
+A. {row['choices']['A']}
+B. {row['choices']['B']}
+C. {row['choices']['C']}
+D. {row['choices']['D']}
+
+Answer (A/B/C/D):"""
+        prediction = model(prompt).strip()[0].upper()
+        if prediction == row["answer"]:
+            correct += 1
+    return correct / len(dataset)
+
+accuracy = evaluate(your_model, ds)
+print(f"ProBench accuracy: {accuracy:.1%}")
+```
+
+## Quality Filters
+
+| Filter | Threshold |
+|---|---|
+| Minimum question score | 10 upvotes |
+| Minimum answer score | 5 upvotes |
+| Accepted answers only | Yes |
+| Minimum answer length | 30 words |
+| Excluded question types | lifestyle, resource lists, book recommendations, tooling |
+
+## Data Collection
+
+- **Source**: Stack Exchange API + data dump (archive.org, 2024-12-31 release)
+- **License**: CC-BY-SA 4.0 — free to use with attribution
+- **Distractors**: Real expert-written answers from other questions in the same domain
+- **No synthetic generation**: every word in every answer comes from a real human expert
+
+## Citation
+
+```bibtex
+@dataset{probench2025,
+  title     = {ProBench: Expert-Level MCQ Benchmark across 5 Professional Domains},
+  year      = {2025},
+  note      = {Sourced from Stack Exchange communities (CC-BY-SA 4.0)},
+  url       = {https://huggingface.co/datasets/lin99/ProBench}
+}
+
+@misc{stackexchange_dump2024,
+  title  = {Stack Exchange Data Dump},
+  author = {{Stack Exchange, Inc.}},
+  year   = {2024},
+  url    = {https://archive.org/details/stackexchange},
+  note   = {Licensed under CC-BY-SA 4.0}
+}
+```
+
+## License
+
+All content is from Stack Exchange and licensed under **CC-BY-SA 4.0**.
+Attribution to Stack Exchange communities is required. Each record includes the original URL.