GLM-TTS

GLM-TTS is a flagship speech synthesis model launched by Zhipu AI. Its core positioning is as a super-human-like text-to-speech (TTS) API aimed at developers and enterprise users, delivering low-latency, highly natural, and emotionally rich speech output experiences. It is suitable for a wide range of applications, including intelligent customer service, audiobook reading, interactive assistants, and more.

• Architectural Innovation: Adopting a two-stage generation process—text2token + token2wav—and integrating reinforcement learning optimization, GLM-TTS produces speech that is more natural, coherent, and emotionally expressive.
• Intelligent Prediction of Emotion and Prosody: Automatically adjusting emotion and prosody based on context significantly enhances the expressiveness of the speech, giving synthesized voices a more authentic “sense of life”.
• Flexible Response Modes: Supporting both non-streaming (completing synthesis of an entire text at once) and streaming (outputting the first frame in less than 400ms in real time), GLM-TTS meets diverse needs—from batch synthesis to interactive scenarios.
• Dynamic Parameter Adjustment: Allowing flexible settings of synthesis parameters such as speech rate and volume according to business requirements, enabling rich vocal styles and rhythmic control.
• Multi-Scenario Applicability: Covering applications such as intelligent customer service, audio content creation, education and teaching, smart assistants, and workplace office work, GLM-TTS elevates speech synthesis from merely “clear articulation” to “emotional resonance”.

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Core Capabilities

⚡ Super-Human-Like Emotional Synthesis: Built-in contextual emotion intelligence analysis ensures that the synthesized speech not only reads out the text but also simulates realistic intonation fluctuations and natural rhythm, making the voice sound more “human-like”.

🚀 Streaming Real-Time Interaction Experience: Supports real-time audio stream output, ideal for interactive scenarios with high latency sensitivity, such as smart assistants and chatbots.

🔧 Highly Controllable Parameters: Offers control over speech rate, volume, and other parameters, allowing customization of specific vocal effects to match brand styles or scenario requirements.

🎧 Rich Voice Selection: Comes with multiple built-in voices, such as “Tongtong,” “Xiao Chen,” and “Chui Chui,” catering to various personality types and content styles for speech synthesis needs.

🧩 Multi-Scenario Integration: Compatible with both non-streaming and streaming synthesis modes, enabling quick integration into business lines such as intelligent customer service, storytelling, and guided tours.

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Effect Demonstration

Text: Hello, welcome to the Zhipu Open Platform

Audio result: file.302ai.cn/gpt/imgs/20251215/b9e6521be9e6f0b6240736cf7ad9c0bf.wav