Allen Institute for AI (Ai2) · Open Science Report Model

AstaBrief 8B

An open-weights 8B model from Ai2, announced 2 October, that turns a research question and retrieved paper excerpts into a cited scientific report. Fine-tuned on 47,000 real researcher queries, then preference-tuned with DPO on 6,000 pairs, with training data filtered for citation density. It now powers Fast mode in Ai2's Asta research assistant at about 51 seconds per report, against 179 seconds for the Claude-powered Thinking mode. Ai2 reports citation and answer precision competitive with Claude-based pipelines and DR Tulu, and says 23% of users who tried Fast mode kept using it; figures are Ai2's own. Weights on Hugging Face under Apache-2.0.