High impact

Retell uses OpenAI models to help power 100M monthly calls

What happened

Retell, a voice AI platform for contact centers, now uses OpenAI models for about 80% of its calls, helping more than 4,000 businesses handle over 100 million monthly calls, up from 30 million earlier in 2026. The company’s own benchmark shows GPT‑6 Astra leading instruction‑following at 89.7%, while earlier GPT‑5.5 performed best on non‑hallucination and tool‑call accuracy. Retell’s engineers rely on Codex for development and GPT‑6 Astra for front‑end testing, and they rerun benchmarks whenever new OpenAI models launch. Customers such as Anker see over 80% case‑resolution rates and high satisfaction scores, and Pine Park Health reports saved staff time equivalent to 2.1 full‑time roles.

Why it matters

For businesses, the ability to automate high‑volume customer calls with reliable AI can cut costs and improve service quality. For everyday users, it means faster, more consistent support experiences.

Reality check

An automated, sceptical read of the source

Mostly marketingIncrementalNotableGenuine breakthrough

Incremental. The article describes scaling existing AI capabilities and modest performance gains rather than a fundamentally new technology.

Who it affectsDevelopersBusinessesEveryday users

What to watchWatch for how Retell’s benchmark scores evolve as OpenAI releases newer models and whether more enterprises adopt the platform.

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