Azure Speech capability selection: custom speech vs LLM speech vs pronunciation vs language ID vs custom voice

This sheet compares Custom speech model, LLM speech, Pronunciation assessment, Language identification, Custom voice.

Criterion	Custom speech model	LLM speech	Pronunciation assessment	Language identification	Custom voice
What it does	Trains on text and audio to recognise domain vocabulary	Preview transcribe and translate with deep context	Scores accuracy and fluency against a reference	Detects which supported language is spoken	Builds a synthesized text-to-speech voice

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