Inworld TTS-1.5 Max
Inworld TTS-1.5 Max is a high-fidelity text-to-speech model engineered for expressive voice synthesis with rich prosody, nuanced emotional range, and broadcast-ready audio quality. It supports a wide set of languages and delivers more natural pronunciation and expressive variation suitable for narration, content creation, and immersive character voices. The Max variant prioritizes audio quality and expressiveness while still supporting responsive generation.
Immersive Story Narration
When the storm finally loosened its grip on the valley, Mira stepped out onto the rain-slick stones and listened. No thunder. No shouting wind. Only the soft dripping of water from the pine branches and, somewhere in the silver fog below, the lonely bell of the harbor lighthouse calling through the dawn. She drew a careful breath, tasted salt and cedar in the air, and unfolded the letter she had carried across three countries. The ink had run at the edges, but the final line was still clear: When the sea grows quiet, come find me.
{
"taskType": "audioInference",
"taskUUID": "0fa1ab9f-3ed8-4b8b-aa9c-540b9eb6f07a",
"model": "inworld:tts@1.5-max",
"audioSettings": {
"bitrate": 192,
"sampleRate": 48000,
"channels": 2
},
"speech": {
"text": "When the storm finally loosened its grip on the valley, Mira stepped out onto the rain-slick stones and listened. No thunder. No shouting wind. Only the soft dripping of water from the pine branches and, somewhere in the silver fog below, the lonely bell of the harbor lighthouse calling through the dawn. She drew a careful breath, tasted salt and cedar in the air, and unfolded the letter she had carried across three countries. The ink had run at the edges, but the final line was still clear: When the sea grows quiet, come find me.",
"voice": "Serena",
"speed": 0.9
},
"settings": {
"temperature": 1.05
}
}{
"taskType": "audioInference",
"taskUUID": "0fa1ab9f-3ed8-4b8b-aa9c-540b9eb6f07a",
"audioUUID": "ceaf10cd-bb8b-40a5-94b3-cf2f87ae9a47",
"audioURL": "https://am.runware.ai/audio/os/a03d21/ws/5/ai/ceaf10cd-bb8b-40a5-94b3-cf2f87ae9a47.mp3",
"cost": 0.00536
}Mythic Trailer Narration
When the last ember faded, the kingdom did not fall in silence. It answered with steel, with thunder, and with the beating hearts of those who refused to kneel. Beyond the black cliffs, beneath a sky split by lightning, one rider carried the map, the oath, and the final spark of hope. By dawn, legends would awaken. By nightfall, the world would remember their names.
{
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"model": "inworld:tts@1.5-max",
"audioSettings": {
"bitrate": 192,
"sampleRate": 48000,
"channels": 2
},
"speech": {
"text": "When the last ember faded, the kingdom did not fall in silence. It answered with steel, with thunder, and with the beating hearts of those who refused to kneel. Beyond the black cliffs, beneath a sky split by lightning, one rider carried the map, the oath, and the final spark of hope. By dawn, legends would awaken. By nightfall, the world would remember their names.",
"voice": "Sebastian",
"speed": 0.9
},
"settings": {
"temperature": 1.12
}
}{
"taskType": "audioInference",
"taskUUID": "f3d5f422-48f8-407b-bcd1-5ca792df673d",
"audioUUID": "17ac2403-f7b9-46db-9263-1ebcbdf3c21b",
"audioURL": "https://am.runware.ai/audio/os/a17d13/ws/5/ai/17ac2403-f7b9-46db-9263-1ebcbdf3c21b.mp3",
"cost": 0.00368
}Cinematic Story Narration
When the last train vanished into the fog, Mara stepped onto the silent platform and unfolded the letter one final time. The ink had faded, but the promise still burned between the lines: at midnight, under the station clock, the truth would finally arrive. Around her, the city held its breath. Then, from somewhere deep in the mist, came the slow echo of approaching footsteps.
{
"taskType": "audioInference",
"taskUUID": "1cf6413f-da48-42ba-9ded-515c239a8128",
"model": "inworld:tts@1.5-max",
"audioSettings": {
"bitrate": 192,
"sampleRate": 48000,
"channels": 2
},
"speech": {
"text": "When the last train vanished into the fog, Mara stepped onto the silent platform and unfolded the letter one final time. The ink had faded, but the promise still burned between the lines: at midnight, under the station clock, the truth would finally arrive. Around her, the city held its breath. Then, from somewhere deep in the mist, came the slow echo of approaching footsteps.",
"voice": "Celeste",
"speed": 0.9
},
"settings": {
"temperature": 1.08
}
}{
"taskType": "audioInference",
"taskUUID": "1cf6413f-da48-42ba-9ded-515c239a8128",
"audioUUID": "9a53c74c-51f6-4650-a3f0-619ed580074a",
"audioURL": "https://am.runware.ai/audio/os/a07d11/ws/5/ai/9a53c74c-51f6-4650-a3f0-619ed580074a.mp3",
"cost": 0.00379
}Emotive Story Narration
When the last train disappeared into the rain, Elena remained alone on the platform, clutching a letter softened by the storm. She had waited ten years for this moment, rehearsing a hundred different greetings, but now that the city lights trembled in the puddles and the night smelled of iron and sea salt, all her words felt small. Then she heard footsteps behind her—slow, familiar, impossible—and the world seemed to hold its breath.
{
"taskType": "audioInference",
"taskUUID": "3ccb5b6a-760e-41d8-a780-c0557bb1c2d5",
"model": "inworld:tts@1.5-max",
"audioSettings": {
"bitrate": 192,
"sampleRate": 48000,
"channels": 2
},
"speech": {
"text": "When the last train disappeared into the rain, Elena remained alone on the platform, clutching a letter softened by the storm. She had waited ten years for this moment, rehearsing a hundred different greetings, but now that the city lights trembled in the puddles and the night smelled of iron and sea salt, all her words felt small. Then she heard footsteps behind her—slow, familiar, impossible—and the world seemed to hold its breath.",
"voice": "Serena",
"speed": 0.9
},
"settings": {
"temperature": 1.12
}
}{
"taskType": "audioInference",
"taskUUID": "3ccb5b6a-760e-41d8-a780-c0557bb1c2d5",
"audioUUID": "b858445e-416e-48c0-875f-362e45287354",
"audioURL": "https://am.runware.ai/audio/os/a04d20/ws/5/ai/b858445e-416e-48c0-875f-362e45287354.mp3",
"cost": 0.00437
}