Braintrust vs Mux
Side-by-side comparison of AI visibility scores, market position, and capabilities
AI observability and eval platform for production AI. $800M valuation after $80M Series B (Feb 2026). Clients: Notion, Cloudflare, Ramp. Founded 2023, SF. Private.
About
Braintrust is an AI observability and evaluation platform founded in 2023 by Ankur Goyal in San Francisco. The platform enables engineering teams to build, test, monitor, and improve AI products by providing tools for prompt engineering, dataset versioning, automated scoring, trace inspection, and quality measurement. Goyal previously founded Impira (acquired by Figma) and led Figma's AI team.
Mux is the video API platform powering Vimeo, Robinhood, CBS, and TED with streaming infrastructure and analytics, generating $46M revenue in 2024 and valued at $1B+.
About
Mux is a video infrastructure company that provides APIs for developers to build streaming video experiences without managing the complex encoding, delivery, and analytics infrastructure that professional video requires. Founded in 2015 by Jon Dahl, Steve Heffernan, Matthew McClure, and Adam Brown—the team behind video.js, the most popular open-source HTML5 video player—Mux brought deep video expertise to the API-first approach that companies like Twilio and Stripe had proven for communications and payments.
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