Adapt
Mini toolsStepAudio 2.5 TTS
By StepFun
StepAudio 2.5 TTS is a contextual speech synthesis model designed to make generated voice act, not just narrate. StepFun describes it as the first TTS system to integrate contextual understanding through the whole speech-generation pipeline, using dual-level control with Global Context and Inline Context plus zero-shot voice cloning. The official documentation lists a 1,000-character maximum input per request and positions it for richer, more expressive spoken output with natural-language guidance over delivery style.
New
Multimodal
Gen 3
Overview
StepAudio 2.5 TTS is StepFun’s contextual text-to-speech model with performance-oriented vocal control. It combines global and inline context guidance with zero-shot voice cloning so generated speech can follow broader style instructions as well as local delivery details, rather than just reading text flatly.
About StepFun
StepFun AI is a creative AI assistant platform that offers chat, search, coding help, and multimodal generation (images, audio, video), plus research models like Step3 and NextStep-1.
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Last updated: April 22, 2026
