Flapping Airplanes Raises $1 Billion at a $6 Billion Valuation

What happened

Flapping Airplanes is an AI lab focused on foundational research that has yet to introduce a commercial product, one of a growing group the industry calls AI "neolabs" — research-first labs. It works on training AI models with substantially less data and computing power, and on making chips more efficient, an approach that runs counter to the industry's dominant strategy of scaling up datasets and compute.

Lead investor Index Ventures disclosed that the team numbers only a couple dozen people, all working in person in San Francisco, optimizing every layer from GPU kernels through pre-training, post-training and inference. Its "megakernels" run an entire program on a GPU as a single kernel, eliminating the wasted time between steps.

The financing was announced on Wednesday, October 21. Index Ventures and Lux Capital co-led the round, with Sequoia Capital, Alphabet's GV and Kleiner Perkins participating; the new valuation is reported to be roughly four times the company's January seed round ($180 million).

A young person's AGI lab.

— Sequoia Capital partner David Cahn (public commentary)

Key facts

1. Round: $1 billion Series A at a $6 billion post-money valuation (Bloomberg, October 21, 2026)
2. Investors: Index Ventures and Lux Capital co-led; Sequoia Capital, Alphabet's GV and Kleiner Perkins participated
3. Company: AI research lab founded in late 2025 by Ben Spector, Asher Spector and Aidan Smith (a Thiel Fellow and former Neuralink employee); no commercial product launched
4. Approach: train models with less data and compute, use chips more efficiently; a couple dozen people, all in person in San Francisco
5. History: closed a $180 million seed round in January; the new valuation is roughly four times that