Retell uses OpenAI models to help power 100M monthly calls

Summary

Retell AI, a voice AI platform for contact centers, now serves more than 4,000 businesses and uses OpenAI models to generate responses for 80% of its calls, with monthly call volume exceeding 100 million by September. Retell's October 13, 2026 benchmark ranked GPT-6 Astra first for instruction following at 89.7%. Retell reports customer resolution rates above 80%.

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