Verto Labs raises $50M to build developer-first Realtime LLM and ships VertoStream

AI · 5 min read

Verto Labs announced a $50 million Series B led by Horizon Labs and launched VertoStream, a serving stack that prioritizes deterministic low-latency outputs for streaming applications including voice agents and in-game NPC dialogues.

VertoStream offers incremental token streaming with adaptive context windows and supports model ensembles for safety and fallback behavior. The stack includes SDKs for WebRTC, mobile, and game engines for easy integration.

The new capital will fund infrastructure scaling, expansions into Asia-Pacific edge regions, and developer experience improvements such as observability dashboards and cost forecasting tools.

Developers testing the stack highlighted the benefit of predictable latency profiles, particularly for voice and interactive gaming where timing is critical to user experience.