Gimlet Labs, an applied research lab dedicated to building next-generation AI infrastructure, led by Zain Asgar, Michelle Nguyen, Omid Azizi, Natalie Serrino, James Bartlett, and the team, has announced $300M Series B raise, led by Andreessen Horowitz and joined by Sapphire Ventures, Menlo Ventures, 645 Ventures, Arm, Eclipse, Emergence, Factory, Hudson River Trading, M12, OnePrime Capital, Prosperity7, QuantumLight, Samsung Ventures, Tiger Global Management, Triatomic, Wing