[AINews] New AI Infra unicorns: Exa, Modal, TurboPuffer

The 2026 AI Engineering Survey has launched, offering participants over $2,000 in credits. Notable achievements include Turbopuffer reaching $100 million in annual revenue and Modal securing $355 million in funding, highlighting rapid growth in the sector. New updates feature models like RAEv2 and Gated DeltaNet-2, with research indicating RAEv2 achieves significant improvements in convergence speed and reconstruction. Additionally, new evaluation methods are being introduced, suggesting untapped potential in AI models.