The text-to-speech (TTS) landscape has evolved rapidly, with new entrants challenging established leaders. Two of the most talked-about TTS models in 2025 are Nari Labs’ open-source Dia 1.6B and the commercial powerhouse ElevenLabs. Both promise lifelike, expressive speech synthesis, but their approaches, capabilities, and accessibility differ significantly. This in-depth

Text-to-speech (TTS) technology has seen rapid advancements, evolving from robotic voices to lifelike AI-generated speech. In 2025, two of the leading open-source models are Nari Dia 1.6B and Sesame CSM 1B. Both offer impressive capabilities in realistic speech synthesis, but they cater to different use cases and offer distinct

Nari Dia 1.6B is an advanced, open-source text-to-speech (TTS) model developed by Nari Labs. With 1.6 billion parameters, it is designed to generate highly realistic, multi-speaker conversational audio. Its open weights and code, Apache 2.0 license, and dialogue-centric features make it a compelling alternative to commercial TTS