Open-sourcing AstaBrief, the fast report-generation model in Asta

AstaBrief, a fast report-generation model in Asta, was open-sourced. For supervised fine-tuning (SFT), 47K usable training examples were generated from filtered queries using the multi-step ScholarQA pipeline. This pipeline retrieved literature, organized material, and synthesized evidence into cited reports using proprietary systems like Claude 3.5 Sonnet, Claude 3.7 Sonnet, o3, o4-mini, and GPT-4.1. The development focused on ensuring scientific faithfulness, addressing issues like meandering reports, incorrect citation support, and overstating claims beyond what the evidence supports.