Model ID

inworld-tts-1.5-mini

Calling method: sync

Inworld TTS 1.5 Mini API Usage Guide

Overview

Inworld TTS 1.5 Mini is a fast and efficient text-to-speech model with enhanced alignment data, including detailed phoneme-level timing and viseme symbols for lip-sync animation. Optimized for lower latency and real-time applications.

Key Features:

65 Voices across 16 languages
Fast Processing: Optimized for lower latency
Enhanced Alignment: Detailed phoneticDetails with phoneme-level timing
Viseme Symbols: Direct lip-sync animation support (aei, o, bmp, fv, l, r, th, qw, ee, cdgknstxyz)
Multiple Formats: MP3, WAV, OGG_OPUS, FLAC, ALAW, MULAW
Text Normalization: Automatic expansion of numbers, dates, abbreviations

Available Voices (65 total)

English (25 voices)

Voice	Description	Tags
Alex	Energetic mid-range male	friendly, expressive
Ashley	Warm, natural female	warm, mellow
Blake	Rich, intimate male	intimate, romantic
Carter	Radio announcer-style male	intense, motivational
Clive	British male, calm	calm, friendly, british
Craig	Older British male, refined	posh, raspy, british
Deborah	Gentle, elegant female	gentle, elegant
Dennis	Smooth, calm male	outgoing, upbeat
Dominus	Robotic, deep male	robotic, monotone
Edward	Fast-talking, emphatic male	emphatic, shouty
Elizabeth	Professional female	informative, calm
Hades	Commanding, gruff male	commanding, gruff
Hana	Bright, expressive female	bright, playful
Julia	Quirky, high-pitched female	childish, quirky
Luna	Calm, relaxing female	calm, relaxing
Mark	Energetic male, rapid-fire	articulate, engaging
Olivia	British female, upbeat	cute, upbeat, british
Pixie	Childlike female	cartoonish, high-pitched
Priya	Female, Indian accent	friendly, gentle
Ronald	British male, deep voice	confident, expressive, british
Sarah	Young adult female	upbeat, excited
Shaun	Friendly, dynamic male	calm, casual
Theodore	Gravelly male, elderly	elderly, wise
Timothy	Lively American male	hyped, upbeat
Wendy	British female, posh	pleasant, casual, british

Chinese 中文 (4 voices)

Voice	Description	Tags
Yichen	年轻男声	clear, friendly
Xiaoyin	年轻女声, 温柔	polite, kind
Xinyi	女声, 中性	professional, warm
Jing	活力女声	soft, clear

Japanese 日本語 (2 voices)

Voice	Description	Tags
Asuka	若い女性	energetic, clear
Satoshi	男性, 表現力豊か	nervous, curious

Korean 한국어 (4 voices)

Voice	Description	Tags
Hyunwoo	젊은 남성	polite, warm
Minji	젊은 여성	light, bright
Seojun	성숙 남성	deep, authoritative
Yoona	여성, 부드러움	sad, clear

Other Languages

French (4): Alain, Hélène, Mathieu, Étienne
German (2): Johanna, Josef
Spanish (4): Diego, Lupita, Miguel, Rafael
Italian (2): Gianni, Orietta
Portuguese-BR (2): Heitor, Maitê
Russian (4): Svetlana, Elena, Dmitry, Nikolai
Dutch (4): Erik, Katrien, Lennart, Lore
Polish (2): Szymon, Wojciech
Hindi (2): Riya, Manoj
Hebrew (2): Yael, Oren
Arabic (2): Nour, Omar

Authentication

All API requests require Basic authentication:

Authorization: Bearer YOUR_API_KEY

Submit TTS Request

Endpoint

POST /api/v1/ie/requestqueue/apikey/requests

Request Format

curl -X POST "https://console.gmicloud.ai/api/v1/ie/requestqueue/apikey/requests" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "inworld-tts-1.5-mini",
    "payload": {
      "text": "Hello, world! What a wonderful day!",
      "voice_id": "Dennis",
      "audio_encoding": "MP3",
      "sample_rate_hertz": 22050,
      "speaking_rate": 1.0,
      "temperature": 1.1,
      "timestamp_type": "WORD"
    }
  }'

Response

Inworld TTS is synchronous and returns results immediately.

{
    "request_id": "abc123-def456",
    "model": "inworld-tts-1.5-mini",
    "status": "success",
    "outcome": {
        "audio_url": "https://storage.googleapis.com/...",
        "media": [{"type": "audio", "url": "https://..."}],
        "usage": {
            "processed_characters": 35,
            "model_id": "inworld-tts-1.5-mini"
        },
        "timestamp_info": {
            "wordAlignment": {
                "words": ["Hello,", "world!"],
                "wordStartTimeSeconds": [0, 0.37],
                "wordEndTimeSeconds": [0.37, 0.83],
                "phoneticDetails": [...]
            }
        }
    }
}

Pricing

Pricing Type: Per character
Price: Contact for pricing
Unit: Characters

Overview

Model Quickstarts

Agents

Coding Tools

AgentBox Guides

Migration Guides

Realtime-tts-1.5-mini

Inworld TTS 1.5 Mini API Usage Guide

Overview

Key Features:

Available Voices (65 total)

English (25 voices)

Chinese 中文 (4 voices)

Japanese 日本語 (2 voices)

Korean 한국어 (4 voices)

Other Languages

Authentication

Submit TTS Request

Endpoint

Request Format

Response

Pricing

​Inworld TTS 1.5 Mini API Usage Guide

​Overview

​Key Features:

​Available Voices (65 total)

​English (25 voices)

​Chinese 中文 (4 voices)

​Japanese 日本語 (2 voices)

​Korean 한국어 (4 voices)

​Other Languages

​Authentication

​Submit TTS Request

​Endpoint

​Request Format

​Response

​Pricing

Inworld TTS 1.5 Mini API Usage Guide

Overview

Key Features:

Available Voices (65 total)

English (25 voices)

Chinese 中文 (4 voices)

Japanese 日本語 (2 voices)

Korean 한국어 (4 voices)

Other Languages

Authentication

Submit TTS Request

Endpoint

Request Format

Response

Pricing