Gradium builds real-time voice AI infrastructure — low-latency streaming speech-to-text, expressive text-to-speech, semantic turn detection, and voice agent frameworks for developers and enterprises.

OpenAI is the maker of ChatGPT and the GPT model family, serving roughly 900M weekly active users with 50M+ paid subscribers — it filed its S-1 on June 8, 2026 ahead of a planned IPO.