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Large Language ModelsAudio & SpeechAmazon AI BlogPublished: Mar 27, 2026, 04:00 JST1 min read

Amazon Polly launches bidirectional streaming API to enable real-time speech synthesis for conversational AI applications powered by large language models.

Amazon Polly launches bidirectional streaming API to enable real-time speech synthesis for conversational AI applications powered by large language models.

3 Key Points

  1. New Bidirectional Streaming API allows simultaneous text input and audio output, eliminating wait times for complete text generation

  2. Designed specifically for conversational AI use cases where text is generated incrementally, such as LLM responses

  3. Enables users to begin audio synthesis before full text is available, improving real-time user experience

  4. Streamlines integration for applications requiring immediate spoken feedback during dynamic content generation

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