Understanding, Learning From, and Designing AI: Our Series B
Today, we're excited to announce a $150 million Series B funding round at a $1.25 billion valuation. The round was led by B Capital, with participation from Juniper Ventures, DFJ Growth, Salesforce Ventures, Menlo Ventures, Lightspeed Venture Partners, South Park Commons, Wing Venture Capital, Eric Schmidt, and others. We started Goodfire because we saw a problem with how today's AI models are built: every frontier model is a black box, making critical decisions while behaving in unpredictable ways not well understood by science. We decided to change that by pushing forward the frontier of interpretability—the science of how neural networks work internally—letting us “open the black box” to understand and edit models. Since then, we've built a world-class team drawn from frontier labs and top research universities, and partnered with industry leaders like Arc Institute, Mayo Clinic, and Microsoft to deploy our technology. We've developed novel techniques to decompose model internals, r
Understanding, Learning From, and Designing AI: Our Series B Blog Understanding, Learning From, and Designing AI: Our Series B February 5, 2026 Contents What we believe What we're building Intentional design Scientific discovery Foundational research Towards alignment Our team Build with us Today, we're excited to announce a $150 million Series B funding round at a $1.25 billion valuation. The round was led by B Capital, with participation from Juniper Ventures, DFJ Growth, Salesforce Ventures, Menlo Ventures, Lightspeed Venture Partners, South Park Commons, Wing Venture Capital, Eric
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