Which API is designed to transcribe audio into text?

The Speech-to-Text API is specifically designed to convert spoken language into text format. It utilizes advanced machine learning models to accurately transcribe audio input, making it a robust solution for applications requiring voice recognition capabilities. The API supports multiple languages and various audio formats, allowing for real-time processing and transcription of both live and pre-recorded audio.

This functionality is essential for creating applications such as voice commands, transcription services, and more, where turning audio speech into text is critical for analysis and integration into other systems. The other options, while useful in their contexts, do not focus on audio transcription. The Cloud Natural Language API is intended for analyzing and understanding text data, while the Video Intelligence API analyzes video content rather than audio transcription directly.