Introducing next-generation audio models in the API

Advancing voice intelligence with new models in the API

Explore new realtime voice models in the OpenAI API that can reason, translate, and transcribe speech, enabling more natural and intelligent voice experiences.

Introducing the Realtime API

Developers can now build fast speech-to-speech experiences into their applications

Expanding on how Voice Engine works and our safety research

Exploring the technology behind our text-to-speech model.

Navigating the challenges and opportunities of synthetic voices

We’re sharing lessons from a small scale preview of Voice Engine, a model for creating custom voices.

Introducing gpt-realtime and Realtime API updates

We’re releasing a more advanced speech-to-speech model and new API capabilities including MCP server support, image input, and SIP phone calling support.

Parloa builds service agents customers want to talk to

Parloa leverages OpenAI models to power scalable, voice-driven AI customer service agents, enabling enterprises to design, simulate, and deploy reliable, real-time interactions.

A New Framework for Evaluating Voice Agents (EVA)

Introducing GPT-Live

A new generation of voice models for natural human-AI interaction, now powering ChatGPT Voice.

Build more natural voice experiences with GPT‑Live‑1 in the API

GPT‑Live‑1 brings natural, full-duplex voice conversations to the API, with stronger instruction following, custom voices, and telephony support.

Conversation Coach: A Voice-enabled AI System that Helps Practice Difficult Workplace Conversations

Conversation Coach is a voice‑first AI system that lets managers rehearse difficult workplace conversations in a realistic spoken format. It tackles low‑latency interaction, adaptive bot personalities that simulate various employee types, and personalized feedback on content and policy compliance. The authors compare an end‑to‑end speech‑to‑speech model with a cascaded approach, finding the former offers lower latency and cost, while the cascaded model provides better reasoning for coaching quality, and they deployed the cascaded architecture to 40,000+ managers over six months.

Safeguards for Speech2Speech LLM-Assistants: A Case Study in Automotive Applications

arXiv:2607. 21180v1 Announce Type: new Abstract: Recent advances have introduced speech-to-speech (S2S) conversational assistants capable of producing natural-sounding interactions, including non-verbal cues like tonality and mood.

Customizable, no-code voice agent automation with GPT-4o

Retell AI is transforming the call center with AI voice automation powered by GPT-4o and GPT-4. 1.