Case Study: How Descript Took New Models Off the Engineering Queue

Descript’s video editing agent, Underlord, runs on frontier models, and the set of models it picks from changes every few weeks. Getting a newly released model through evaluation used to take more than a week, and the testing itself was not the slow part. With OpenRouter as its production inference layer, Descript now evaluates models multiple times a week, runs 13 in production, and took a recent Anthropic release from announcement to live in a couple of hours. Descript is an AI-powered video and audio editing platform. It combines transcript-based editing with AI tools for audio enhancement, voice cloning, and generative media, so teams can produce studio-quality content without specialized expertise. Enterprise customers in healthcare, financial services, media, and technology use Descript to scale content production while keeping human control over every creative decision. Underlord, Descript’s video editing agent, pairs LLMs with a harness that tells the model how to act and how to edit video. Aleks Mistratov, who heads AI product at Descript, says Descript specializes in talking-head video. That covers YouTube…