Antithesis Secures $105M Series A as AI-Generated Code Accelerates Testing Demand

Antithesis, a software-testing platform built on deterministic simulation technology, has raised $105 million in Series A funding at a $525 million post-money valuation in December 2025, with founders already exploring a second funding round at a substantially higher valuation. The Vienna, Virginia-based company reported that revenue has grown more than 12 times over the past two years, driven by surging adoption among developers deploying AI-generated code and seeking to manage testing complexity at scale.