text-to-audio
Inworld 1.5 Max delivers premium text-to-speech synthesis with 56+ multilingual voices, adjustable speaking rate, and high-fidelity natural-sounding audio output. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.
Idle
Votre requête coûtera $0.01 par exécution.
Pour $1 vous pouvez exécuter ce modèle environ 100 fois.
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README
Inworld 1.5 Max Text-to-Speech
Inworld 1.5 Max is a high-quality text-to-speech model that converts written text into natural, expressive speech. Choose from a variety of voice presets, fine-tune speaking rate and expressiveness with simple controls, and generate professional-grade audio in seconds — ideal for IVR systems, voiceovers, content creation, and accessibility.
Why Choose This?
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Natural-sounding voices Multiple voice presets with realistic intonation, pacing, and emotion for lifelike speech output.
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Voice selection Choose from a library of distinct voice identities to match your brand, character, or use case.
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Speaking rate control Adjust the speed of speech to suit narration, dialogue, announcements, or any delivery style.
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Temperature control Fine-tune expressiveness — lower values for consistent, predictable delivery; higher values for more dynamic, varied speech.
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Ultra-low cost Just $0.01 per 1,000 characters — affordable even at scale.
Parameters
| Parameter | Required | Description |
|---|---|---|
| text | Yes | The text content to convert to speech |
| voice_id | No | Voice preset to use (e.g., Elizabeth) |
| speaking_rate | No | Speed of speech (default: 1) |
| temperature | No | Expressiveness level (default: 1) |
How to Use
- Enter your text — type or paste the content you want converted to speech.
- Select a voice — choose a voice preset from the voice_id dropdown.
- Adjust speaking rate — slide to control how fast or slow the speech is delivered.
- Adjust temperature — slide to control the expressiveness and variation in delivery.
- Run — submit and download the generated audio.
Pricing
| Characters | Cost |
|---|---|
| Up to 1,000 | $0.01 |
| Up to 2,000 | $0.02 |
| Up to 5,000 | $0.05 |
| Up to 10,000 | $0.10 |
Billing Rules
- Rate: $0.01 per 1,000 characters
- Rounding: character count is rounded up to the next 1,000
Best Use Cases
- IVR & Phone Systems — Generate professional call menus, hold messages, and automated responses.
- Video Voiceovers — Add narration to marketing videos, tutorials, and presentations.
- Content Creation — Convert blog posts, articles, or scripts into audio for podcasts and social media.
- Accessibility — Provide audio versions of written content for visually impaired users.
- Game & App Dialogue — Create character voices for interactive experiences and virtual assistants.
Pro Tips
- Keep speaking_rate around 1 for natural-sounding narration; lower for dramatic reads, higher for fast announcements.
- Use lower temperature for consistent, predictable voiceovers (e.g., IVR); higher temperature for more expressive character dialogue.
- Break long texts into logical paragraphs for better pacing and natural pauses.
- Test different voice_id options to find the best match for your brand or character.
Notes
- Text is the only required field.
- Billing is based on character count, rounded up to the nearest 1,000.
- Very long texts may take slightly longer to process.