请问HN：谁在做最好的Word/PDF RAG工具，并且有深入的研究？
嗨，HN，最近你在关注哪些SaaS提供商，以满足你在处理成千上万的PDF或Word文档时的RAG需求，并且希望有一个可以慢慢处理并提供经过充分研究和引用的答案的智能助手？谢谢！
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Hi HN, which SaaS providers are you eyeing up these days for your RAG needs with thousands of PDFs or Word docs and with a agent that can take its time and give well researched, cited answers? TIA!