ChemCrow is an open-source research agent that augments GPT-4 with 18 expert-designed chemistry tools, using the LLM as a reasoning engine that iteratively calls specialized capabilities rather than relying on memorized chemical knowledge. It follows a Thought-Action-Observation loop to plan and execute tasks across organic synthesis, drug discovery, and materials design. The system autonomously planned and executed the synthesis of an insect repellent and three organocatalysts, and guided discovery of a novel chromophore. It was published in Nature Machine Intelligence in 2024. Key features: - 18 integrated chemistry tools covering reaction planning, molecule lookup, and safety checks - LLM reasoning engine (GPT-4) with iterative tool-calling loop (Thought/Action/Observation) - Chemical safety checks including ChemicalWeaponCheck, ExplosiveCheck, and PatentCheck - Python code execution for complex computations and AI model training within tasks - Access to scientific literature via search and PDF/HTML extraction - Validated on real robotic synthesis platforms for wet-lab execution
Free (open-source, MIT license, self-hosted)