Flapping Airplanes raises $1B at $6B valuation, quadrupling worth in nine months
San Francisco AI research lab Flapping Airplanes has raised a $1 billion Series A round at a $6 billion valuation, co-led by Index and Lux. The company, founded in late 2025, has quadrupled its valuation since its $180 million seed round in January. It focuses on training models with less data and compute, aiming to maximize chip efficiency. The funding highlights the rapid growth of AI 'neolabs' prioritizing research over immediate products.
Key points
- Flapping Airplanes, an AI research startup founded in late 2025 by Aidan Smith and brothers Asher and Ben Spector, raised $1 billion in a Series A round.
- The round, co-led by Index Ventures and Lux Capital, valued the company at $6 billion, quadrupling its $1.5 billion valuation from a $180 million seed round in January.
- The company aims to train AI models with less data and compute by writing custom software for Nvidia graphics chips to improve performance efficiency.
- Co-founder Asher Spector stated that the core thesis is that AI demand will outpace chip and data supply, making incremental performance gains economically significant.
- The startup is part of a growing category of AI 'neolabs' that focus on foundational research before developing commercial products, similar to AMI Labs and Mirendil.
- Notable investors in the new round include Sequoia Capital, GV, Kleiner Perkins, Valor, Atreides, A*, and Nvidia, reflecting strong institutional confidence in the team.
Flapping Airplanes, a San Francisco-based AI research laboratory, has secured $1 billion in new funding at a $6 billion valuation. The Series A round was co-led by Index Ventures and Lux Capital, with participation from existing investors including Sequoia Capital, GV, and Kleiner Perkins. This valuation marks a fourfold increase from the $1.5 billion valuation achieved during its $180 million seed round in January, just nine months after the company’s launch.
The startup, founded by Aidan Smith and brothers Asher and Ben Spector, focuses on optimizing AI training efficiency. Rather than building consumer-facing products immediately, the team is developing a "megakernel framework" to train large models using less data and computing power. Co-founder Asher Spector explained that the company’s thesis is that demand for AI will outpace the supply of chips and data, making even small improvements in chip performance highly valuable. To achieve this, the company is writing its own software layer for Nvidia graphics chips, a move that has attracted investment from Nvidia itself.
Flapping Airplanes joins a rising cohort of AI "neolabs," such as AMI Labs and Mirendil, which prioritize fundamental research over rapid productization. The founders, who include former Thiel fellows and Stanford PhDs, have been described by investors as building a "young person’s AGI lab." The rapid valuation growth underscores the intense capital competition for early-stage AI research teams capable of solving computational bottlenecks.
Sources
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