OpenAI Launches Advanced Speech-to-Text and Text-to-Speech Models for Developers

  • Mar, Mon, 2025
  • AI News
  • 2 minutes Read

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Explore OpenAI’s GPT-4o voice models, enhancing transcription accuracy and realistic text-to-speech for building reliable AI agents and chatbots.

OpenAI has introduced new AI models for transcribing speech and generating voice in its API. These models improve significantly over previous versions. The goal is to help developers easily build AI “agents,” automated systems that perform tasks for users, like customer service chatbots.

The new text-to-speech model, called “gpt-4o-mini-tts,” creates speech that is more realistic and flexible. Developers can guide the model using natural language instructions. For example, they can request the voice to sound like a “mad scientist” or a calming “mindfulness teacher.” This allows developers to tailor the voice tone for different situations, such as customer support interactions where emotion matters.

OpenAI also released two new speech-to-text models: “gpt-4o-transcribe” and “gpt-4o-mini-transcribe,” replacing its older Whisper model. These newer models are trained on diverse audio samples and can handle accents and noisy environments better. They are also more accurate and less prone to errors or “hallucinations”—Whisper was known for occasionally inventing incorrect phrases or passages.

However, accuracy can vary depending on the language. For example, gpt-4o-transcribe still has a relatively high error rate in languages like Tamil and Telugu, where approximately 30% of transcribed words differ from human transcription.

Unlike Whisper, these new transcription models will not be open-sourced because they are larger and unsuitable for running on personal devices like laptops. OpenAI aims to release open-source models only when they are well-suited to specific, practical needs.

Overall, these updates allow greater control and reliability in speech interactions, enabling developers to create voice experiences tailored closely to user needs and contexts.

This article was sourced from TechCrunch. For more details, please read: OpenAI upgrades its transcription and voice-generating AI models

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