AI map/Tools/Search and research
In the catalog since Aug 19, 2026
Semantic Scholar
1index_Ai2Company
Scientific search from the Ai2 institute: 214 million papers with parsed citations and a one-line TLDR summary. A nonprofit project that provides its data through a free API.
Facts
- Launched in 2015 at the nonprofit Ai2 (Allen Institute for AI), founded by Paul Allen in 2014.
- As of 08.2026, the graph contains 214M papers, 2.49B citations, and 79M authors; search ranks by a work's influence rather than word matches.
- The API is free: Academic Graph (S2AG), similar-paper recommendations, dataset exports, and SPECTER2 embeddings; without a key, the limit is 1,000 requests per second across all anonymous users.
- The open S2ORC corpus in the May 26, 2026 release contains 15,679,781 articles with parsed full text.
The full card is in the works: the "worth it or not" verdict, pricing and a comparison with neighbors will appear as it moves through the card factory.