Which service should be used for real-time speech recognition?

Using Amazon Transcribe is the most appropriate choice for real-time speech recognition. This service is specifically designed to convert spoken language into text, enabling applications to understand and process voice input. It supports a variety of audio formats and can be utilized for tasks such as transcribing voice calls, meetings, or videos in real-time, making it well-suited for scenarios where immediate speech-to-text conversion is required.

The other services mentioned serve different purposes. AWS Glue is primarily a data integration service used for preparing and transforming data for analytics, rather than handling speech recognition tasks. Amazon Lex is focused on building conversational interfaces using voice and text, but it is not designed for real-time transcription of audio into text. Amazon Comprehend is a natural language processing service that analyzes text for sentiment and key phrases, but does not handle speech recognition.

Overall, Amazon Transcribe stands out as the appropriate service for accurately converting spoken language into written text in real-time contexts.