Retell uses OpenAI models to help power 100M monthly calls
GPT-6 Astra tops Retell's voice benchmark powering 100M monthly calls
Retell AI is using OpenAI's GPT-6 Astra model to power 100 million monthly voice agent calls, with the model topping Retell's internal voice benchmark. Codex is also contributing to engineering productivity, helping the company reach $1.6M ARR per employee. This signals GPT-6 Astra's early traction in real-time voice infrastructure at scale.