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Ai2 open-sourced AstaBrief 8B on October 2: built on Qwen3-8B, it turns a question plus literature excerpts into a cited research report in one pass, without retrieval. It now powers the Fast mode of Asta reports, averaging 51.1 seconds — 3.5x faster than the Thinking mode, per Ai2 — and weights and training data are released under Apache 2.0.