{"model":"inworld-tts-2","air":"inworld:tts@2","name":"Inworld Realtime TTS-2","creator":"inworld","status":"live","releasedAt":"2026-05-05T00:00:00Z","weight":5,"headline":"Conversational text-to-speech with realtime voice direction and audio-aware delivery","description":"Inworld Realtime TTS-2 is a conversational text-to-speech model built for realtime voice interaction rather than static narration. It supports free-form voice direction, carries tone and pacing forward from prior audio in a session, preserves one voice identity across 100+ languages, and is designed for expressive, low-latency speech in assistants, characters, support agents, and interactive products.","capabilities":["io:text-to-audio","form:checkpoint"],"coverImage":"https://assets.runware.ai/covers/inworld-tts-2.jpg","ogImage":"https://assets.runware.ai/og/inworld-tts-2.png","pricingRates":[{"amount":0.000035,"unit":"character"}],"pricingExamples":[{"configuration":"text-to-audio","price":"$0.00154","latencyMs":2307,"exampleId":"immersive-greenhouse-warning-cue"},{"configuration":"text-to-audio","price":"$0.00263","latencyMs":1752,"exampleId":"roller-derby-livestream-vocal-stinger"},{"configuration":"text-to-audio","price":"$0.00507","latencyMs":3721,"exampleId":"polish-numbers-station-voice-loop"},{"configuration":"text-to-audio","price":"$0.00577","latencyMs":3711,"exampleId":"italian-heritage-podcast-intro"}],"guides":[{"slug":"llm-system-prompts","title":"Formatting LLM output for speech","description":"How to write LLM system prompts that produce text TTS-2 can synthesize naturally, with normalization, filler words, and emphasis cues handled before the audio call.","date":"2026-05-20","url":"https://runware.ai/docs/models/inworld-tts-2/guides/llm-system-prompts"},{"slug":"voice-direction","title":"Controlling voice delivery with steering tags","description":"How to use natural-language steering tags to control emotion, pacing, volume, and vocal style in TTS-2 speech output.","date":"2026-05-22","url":"https://runware.ai/docs/models/inworld-tts-2/guides/voice-direction"}]}