OPENAI · 2026-10-27 22:08 UTC

Retell uses OpenAI models to help power 100M monthly calls

Retell AI, a voice AI platform for contact centers, has grown monthly call volume from 30 million in early 2026 to over 100 million by September, serving 4,000+ businesses. OpenAI models power 80% of Retell's calls with 80%+ resolution rates; Retell has consumed over 1 trillion tokens across OpenAI models. In Retell's benchmarks, GPT-6 Astra ranked first for instruction following (89.7%), and GPT-5.5 led on non-hallucination rate (88.0%) and tool-call correctness (88.3%).

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