Goodfire Raises $50M Series A to Advance AI Interpretability Research

Funding from Menlo Ventures powers Goodfire's mission to decode the neurons of AI models, reshaping how they're understood and designed

SAN FRANCISCO, April 17, 2025 /PRNewswire/ -- Today, Goodfire, the leading AI interpretability research company, announced a $50 million Series A funding round led by Menlo Ventures with participation from Lightspeed Venture Partners, Anthropic, B Capital, Work-Bench, Wing, South Park Commons, and other notable investors. This funding, which comes less than one year after its founding, will support the expansion of Goodfire's research initiatives and the development of the company's flagship interpretability platform, Ember, in partnership with customers.

"AI models are notoriously nondeterministic black boxes," said Deedy Das, investor at Menlo Ventures. "Goodfire's world-class team—drawn from OpenAI and Google DeepMind—is cracking open that box to help enterprises truly understand, guide, and control their AI systems."

Despite remarkable advances in AI, even leading researchers have little idea of how neural networks truly function. This knowledge gap makes neural networks difficult to engineer, prone to unpredictable failures, and increasingly risky to deploy as these powerful systems become harder to guide and understand.

"Nobody understands the mechanisms by which AI models fail, so no one knows how to fix them," said Eric Ho, co-founder and CEO of Goodfire. "Our vision is to build tools to make neural networks easy to understand, design, and fix from the inside out. This technology is critical for building the next frontier of safe and powerful foundation models."

To solve this critical problem, Goodfire is investing significantly in mechanistic interpretability research – the relatively nascent science of reverse engineering neural networks and translating those insights into a universal, model-agnostic platform. Known as Ember, Goodfire's platform decodes the neurons inside of an AI model to give direct, programmable access to its internal thoughts. By moving beyond black-box inputs and outputs, Ember unlocks entirely new ways to apply, train, and align AI models — allowing users to discover new knowledge hidden in their model, precisely shape its behaviors, and improve its performance.

"As AI capabilities advance, our ability to understand these systems must keep pace. Our investment in Goodfire reflects our belief that mechanistic interpretability is among the best bets to help us transform black-box neural networks into understandable, steerable systems—a critical foundation for the responsible development of powerful AI," said Dario Amodei, CEO and Co-Founder of Anthropic.

Looking ahead, Goodfire is accelerating its interpretability research through targeted initiatives with frontier model developers. By closely partnering with industry innovators, Goodfire will rapidly enhance and solidify the application of interpretability research. "Partnering with Goodfire has been instrumental in unlocking deeper insights from Evo 2, our DNA foundation model," said Patrick Hsu, co-founder of Arc Institute – one of Goodfire's earliest collaborators. "Their interpretability tools have enabled us to extract novel biological concepts that are accelerating our scientific discovery process."

The company also plans to release additional research previews, highlighting state-of-the-art interpretability techniques across diverse fields such as image processing, advanced reasoning language models, and scientific modeling. These efforts promise to reveal new scientific insights and fundamentally reshape our understanding of how we can interact with and leverage AI models.

The Goodfire team unites top AI interpretability researchers and experienced startup operators from organizations like OpenAI and Google DeepMind. Goodfire's researchers helped found the field of mechanistic interpretability, authoring three of the most-cited papers and pioneering advancements like Sparse Autoencoders (SAEs) for feature discovery, auto-interpretability frameworks, and revealing the hidden knowledge in AI models.

About Goodfire
Goodfire is an AI interpretability research company and public benefit corporation based in San Francisco, dedicated to understanding and intentionally designing advanced AI systems. Backed by Menlo Ventures, Lightspeed Venture Partners, Anthropic, B Capital, Work-Bench, Wing, South Park Commons, and others, Goodfire believes advances in interpretability will unlock the next frontier of safe and powerful foundation models. Learn more at goodfire.ai and x.com/goodfireAI.

About Menlo Ventures
Menlo Ventures is a leading early-stage venture capital firm investing at the forefront of AI. Our portfolio includes more than 80 public companies and over 165 exits through mergers and acquisitions since our founding nearly 50 years ago. Currently managing more than $6 billion in assets, we invest at every stage across Consumer, Enterprise, and Healthcare. Our portfolio companies include Abnormal Security, Anthropic, Benchling, Carta, Chime, Harness, Pinecone, Poshmark, Pillpack, Recursion, Roku, Rover, Siri, Typeface, Uber, and Warby Parker. We strive to have a positive impact on everything we do. When we're in, we're ALL IN.

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SOURCE Goodfire