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Retell uses openai models to power 100 million monthly calls

Retell relies on openai models to handle over 100 million monthly calls for its voice ai platform and 4,000 businesses.

Retell uses openai models to power 100 million monthly calls — image from OpenAI
Image: OpenAI

Summary

Retell uses openai models to power its voice ai platform, which now handles more than 100 million monthly calls. Openai models generate responses for 80 percent of calls on the platform. The company also uses these models for engineering work and testing front-end interfaces.

What changed

  • Retell uses openai models to generate responses for 80 percent of calls on its platform.
  • Monthly call volume grew from 30 million in early 2026 to over 100 million by September.
  • Retell engineers use codex for coding tasks and gpt-6 astra to test front-end interfaces.

Availability

Available now

“Customers also have access to OpenAI Realtime models through the Realtime API and OpenAI text-to-speech as a voice engine.”

Founder takeaway

Small teams building voice agents can review how platforms integrate specialized models for latency-sensitive audio handling and automated code debugging.

Source

OpenAIRetell uses OpenAI models to help power 100M monthly calls

Announced Checked

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