LangChain now claims 7,000 customers of its model and platform agnostic agent management tool LangSmith. Agent management startup LangChain has raised a $300 million Series C at a $3 billion valuation led by CapitalG, with participation from investors, including Singapore’s GIC, DFJ Growth, IVP, and Sapphire Ventures, the company announced on Friday. That’s more than double its $1.25 billion valuation when it raised $125 million about a year ago, led by IVP.