# OpenAI — Retell uses OpenAI models to help power 100M monthly calls

- Company: OpenAI (openai.com)
- Announced: 2026-10-27T15:00:00+00:00
- Category: not stated
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://openai.com/index/retell-ai
- Record: https://forck.live/items/28517-retell-uses-openai-models-to-help-power-100m-monthly-calls
- Subject: GPT / ChatGPT / API
- Models affected: GPT-6 Astra, GPT-5.5, GPT-6.1 Sol, GPT-5.6 Terra, GPT-5.6 Luna, GPT-6 Sol

Retell AI, a voice AI platform for contact center operations, says OpenAI models now generate responses for 80% of the calls on its platform, which grew from 30 million monthly calls in early 2026 to more than 100 million by September. The company serves more than 4,000 businesses and has consumed over 1 trillion OpenAI tokens, with customers reporting resolution rates above 80%. Retell built its vCX benchmark to compare models on difficult multi-turn conversations drawn from production scenarios; in its October 13, 2026 benchmark, GPT-6 Astra ranked first for instruction following at 89.7%. Evaluations run before GPT-6 Astra's launch showed GPT-5.5 ranking highest among models on non-hallucination rate (88.0%) and tool-call correctness (88.3%) with reasoning enabled, ahead of Gemini-3.1-Pro and Claude-4.6. Retell uses dedicated servers with OpenAI and regional API endpoints to cut network travel time and meet data residency needs in healthcare and financial services. At Anker, agents handling Tier-1 post-sales support in the US and UK reported an 80.4% case resolution rate and an NPS of 63, while Pine Park Health recovered medical-assistant time equal to 2.1 full-time roles.

## Evidence

Verbatim from https://openai.com/index/retell-ai:

> Today, OpenAI models generate responses for 80% of calls on Retell, with customers achieving resolution rates above 80%. Retell has also surpassed 1 trillion tokens consumed across OpenAI models, reflecting the scale of that adoption.

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