The hottest AI startup funding rounds: Flapping Airplanes, Legora, Blacksmith, and Mach9 Other

Let's talk about a few of the hottest startup rounds from this week.

Flapping Airplanes

Flapping Airplanes raised a B Series A at a B valuation to build biologically inspired AI reasoning foundation models. Today, the biggest bottleneck for AI is that autoregressive language models plateau on genuine multi-step planning, and Flapping Airplanes is training models inspired by neural biological mechanics rather than text tokens. They were founded just nine months ago and multiplied their valuation by 4x from their .5B launch round, drawing heavy backing from Nvidia, Sequoia, and GV.

Legora

Legora raised a M Series E at an .8B valuation to automate complex enterprise legal and contract workflows. In-house legal teams spend tens of thousands of billable hours manually redlining vendor agreements and navigating complex cross-border compliance, and Legora is replacing those manual pipelines with specialized legal agent workforces. The raise kicks off an aggressive AI arms race directly against legal AI titan Harvey, which crossed M in ARR last quarter.

Blacksmith

Blacksmith raised an M Series C at a B unicorn valuation to accelerate cloud software continuous integration pipelines. As coding agents write an unprecedented share of the world's pull requests, the critical roadblock is verifying whether the code actually compiles and passes tests without stalling engineering teams for hours. Sequoia preempted the financing round to crown Blacksmith the newest developer infrastructure unicorn in under two years.

Mach9

Mach9 raised a M Series A at an undisclosed valuation to turn raw laser sensor data into instant engineering maps. Civil engineers scan highways and bridges with massive lidar systems but spend weeks manually tracing lines into CAD models, and Mach9 replaces that tedious drafting with computer vision models that generate CAD files in seconds. The founder completely abandoned building physical hardware robots after realizing workflow software was the true bottleneck, and over 100 enterprise customers have already processed 2,500 infrastructure projects on the platform.

A common thread across all four deals is that venture capital is aggressively funding startups eliminating physical and architectural bottlenecks for AI, from hardware CAD and test infrastructure to bio-inspired foundation models.

Startup Breakdown

Sources

• TechCrunch: Year-old AI lab Flapping Airplanes raises B at a B valuation
• TechCrunch: Legal AI startup Legora raises M Series E at .8B valuation
• TechCrunch: Blacksmith hits unicorn valuation after Sequoia leads Series C
• TechCrunch: Mach9 raises M after pivoting to AI CAD software