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Inworld TTS-1.5 Max holds the #1 position on Artificial Analysis with an ELO score of 1,215, while ElevenLabs Eleven v3 ranks #2 at ELO 1,179. These rankings are determined by blind listening tests conducted by thousands of real users, not internal evaluations. Inworld claims over 30% more expressiveness than its own previous models, with optimized stability to eliminate hallucinations and audio artifacts. Notably, Inworld occupies 3 of the top 5 spots on the leaderboard (TTS-1.5 Max, TTS-1 Max at #3, and TTS-1.5 Mini at #5), suggesting consistent quality across their entire model lineup.
Inworld TTS is built for realtime applications from the ground up. The TTS-1.5 Mini model delivers first-chunk audio in approximately 130ms, while the higher-quality TTS-1.5 Max achieves ~250ms — both well under the 350ms natural human response time threshold. Audio is streamed via WebSocket with no buffering delay, meaning playback begins the instant the first chunk is synthesized. The platform maintains consistent P90 performance under production load, making it reliable for voice assistants, live customer service bots, and other latency-sensitive conversational AI applications.
Inworld TTS offers three methods for creating custom voices. Instant cloning requires just 15 seconds of audio and produces a usable voice in seconds. Text-based voice design lets you describe the voice you want in natural language (e.g., 'A warm, friendly female voice with a slight British accent') and generates a matching voice. For maximum fidelity, professional cloning uses 30+ minutes of audio to create a highly accurate voice replica. All three methods produce production-ready voices that can be used immediately via the API or in the interactive Playground.
Inworld TTS supports multiple audio encoding formats including WAV, OGG_OPUS, and LINEAR16. Sample rates are configurable up to 48kHz for high-fidelity output, with 16kHz also available for lower-bandwidth applications. The API supports both HTTP streaming (via NDJSON response chunks) and WebSocket streaming for persistent connections. Each response chunk contains base64-encoded audio that can be decoded and played back incrementally for low-latency playback. Speaking rate is also adjustable to control the speed of speech output.
Inworld TTS supports 15+ languages for text-to-speech synthesis. While the website does not list every supported language individually, the multilingual capability is integrated across all model tiers including TTS-1.5 Max and TTS-1.5 Mini. This makes it suitable for global applications requiring natural-sounding speech across different linguistic markets. The same voice cloning and voice design features are available across supported languages, allowing developers to create custom voices that work in multiple language contexts.
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Tutorial updated March 2026