A secretive startup building a universal AI interface has secured $700 million in Series A funding. The round values Hark at $6 billion, according to sources familiar with the deal.

Brett Adcock, the founder behind the venture, has kept details of the technology under wraps. The company describes its product as a universal AI interface, though it has not publicly demonstrated the system.

The Funding Round

The $700 million Series A is among the largest early-stage rounds in AI history. Investors include major venture capital firms and strategic partners, though specific names have not been disclosed. The raise suggests deep confidence in Adcock's vision, which remains largely unproven in public markets.

Adcock previously founded Archer Aviation and Joby Aviation, two electric aircraft companies. His track record in building capital-intensive hardware startups likely contributed to the outsized round.

What Is a Universal AI Interface

Hark aims to create a single interface that can interact with multiple AI models and systems. The goal is to abstract away the complexity of different AI tools, allowing users to route tasks to the best model automatically. This concept, sometimes called an AI operating system or meta-layer, has attracted interest as companies seek to avoid vendor lock-in.

The company has not revealed technical specifications or a timeline for public release. Secrecy has fueled both curiosity and skepticism. Rivals include emerging AI middleware platforms and large language model providers themselves.

Why This Matters

The size of the round signals that investors believe a universal AI interface could become a critical infrastructure layer. If Hark succeeds, it could reshape how businesses deploy AI, reducing reliance on any single model provider. The valuation also reflects the intense competition for talent and capital in the AI sector.

For consumers and enterprises, a successful universal interface could mean lower costs, better performance and more flexibility. But the technology is unproven and the market remains crowded with competing approaches. The outcome will depend on Hark's ability to deliver a product that outperforms existing solutions.