OpenResearcher/OpenResearcher-Corpus

Adopted by NVIDIA's Nemotron family of models!

🤗 HuggingFace ｜ Slack | WeChat

OpenResearcher Corpus

This dataset contains a carefully curated ~11B-tokens corpus, which serves as an offline search engine for our data generation process, eliminating the need for external Search APIs. Details on the corpus curation process are available in our blog.

Format

Each row in the dataset contains the following fields:

• docid (string): A unique identifier for each document in the corpus.
• text (string): The complete text content of the document. Contains the full body of web pages.
• url (string): The source URL where the document was retrieved from.

How to use this dataset?

You can use this dataset together with its embeddings to build an offline search engine. Below is a pseduo code for demonstration only (for production use, consider Faiss-GPU).

# download index before
huggingface-cli download OpenResearcher/OpenResearcher-Corpus --repo-type=dataset --include="qwen3-embedding-8b/*" --local-dir ./indexes

import glob
import pickle
import faiss
import numpy as np
from datasets import load_dataset
from sentence_transformers import SentenceTransformer

# 1. Load corpus
corpus = load_dataset("OpenResearcher/OpenResearcher-Corpus", split="train")
docid_to_doc = {str(doc["docid"]): doc for doc in corpus}

# 2. Load all embedding shards from OpenResearcher-Indexes
index_files = sorted(glob.glob("path/to/indexes/*.pkl"))
all_embeddings = []
all_lookup = []

for file_path in index_files:
    with open(file_path, "rb") as f:
        embeddings, lookup = pickle.load(f)
        all_embeddings.append(embeddings)
        all_lookup.extend(lookup)

all_embeddings = np.vstack(all_embeddings).astype(np.float32)
faiss.normalize_L2(all_embeddings)  # Normalize for cosine similarity

# 3. Build FAISS index
index = faiss.IndexFlatIP(all_embeddings.shape[1])
index.add(all_embeddings)

# 4. Load model and encode query
model = SentenceTransformer("Qwen/Qwen3-Embedding-8B")
query = "What is machine learning?"
query_embedding = model.encode([query], prompt_name="query")

# 5. Search in FAISS
scores, indices = index.search(query_embedding, k=5)

# 6. Print results
for idx, score in zip(indices[0], scores[0]):
    docid = str(all_lookup[idx])
    doc = docid_to_doc.get(docid)
    if doc:
        print(f"Score: {score:.4f}")
        print(f"URL: {doc['url']}")
        print(f"Text: {doc['text'][:200]}...\n")

Citation

@article{li2026openresearcher,
  title={{OpenResearcher: A Fully Open Pipeline for Long-Horizon Deep Research Trajectory Synthesis}},
  author={Li, Zhuofeng and Jiang, Dongfu and Ma, Xueguang and Zhang, Haoxiang and Nie, Ping and Zhang, Yuyu and Zou, Kai and Xie, Jianwen and Zhang, Yu and Chen, Wenhu},
  journal={arXiv preprint arXiv:2603.20278},
  year={2026}
}