FractalAIResearch/Fathom-Synthesizer-4B

Fathom-Synthesizer-4B by FractalAIResearch is a 4 billion parameter model designed for open-ended synthesis and report generation within the Fathom-DeepResearch agentic system. It excels at transforming search and investigation traces into citation-dense reports, utilizing a novel plan-then-write protocol. With a context length of 40960 tokens, this model is optimized for long-horizon information retrieval and synthesis tasks.