
Truly open breakthrough AI.

AI-powered answer engine for real-time, cited information and advanced research.
Ai2: Truly open breakthrough AI.. Perplexity AI: AI-powered answer engine for real-time, cited information and advanced research.. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. Ai2 is free and Perplexity AI is freemium.
The best choice between Ai2 and Perplexity AI depends on your specific needs. Compare their features, pricing, and target audience on this page to find the tool that best fits your use case.
Ai2 is primarily designed for individuals, while Perplexity AI is built for individuals.
Ai2 offers: Open language models (OLMo), Multimodal AI models, AI for science applications (Asta), Semantic scientific search (Semantic Scholar). Perplexity AI offers: Real-time answers with cited sources, Perplexity Computer for autonomous, multi-model AI workflows, Access to advanced AI models (GPT-5.1, Claude Opus 4.5, o3-pro, etc.), File upload and analysis (PDFs, spreadsheets, reports).
Based on our data, Perplexity AI currently enjoys greater popularity. However, popularity isn't the only factor — compare features to find the right tool for your needs.