Retell leverages OpenAI models to power 100m monthly calls

Retell AI, a voice AI platform for contact centers, has surpassed 100 million monthly calls, with its platform now serving over 4,000 businesses. OpenAI models power 80% of calls, contributing to resolution rates above 80%. Retell has consumed over 1 trillion tokens across OpenAI models, highlighting their widespread adoption. GPT-6 Astra led Retell’s October 13, 2026 benchmark with an 89.7% instruction-following score. Codex aids in development, while GPT-6 Astra tests front-end interfaces. Retell also reported a $1.6 million annual revenue run rate per employee. Retell’s agents handle complex workflows, adhering to company policies and integrating with customer systems. At Anker, agents achieved an 80.4% resolution rate and a 63 NPS. Pine Park Health recovered 2.1 full-time roles by using Retell for scheduling. OpenAI’s regional endpoints help meet data residency requirements, and Retell’s redundancy measures ensure service continuity. Bing emphasized that Retell empowers companies to build in-house AI teams. The company plans to expand quality assurance, support more languages, and develop knowledge base auto-learning. As OpenAI models advance, Retell expects its customers to deliver world-class service to millions of callers.