Available through OpenAI’s API, this model makes it easy for developers to give their applications a voice that actually sounds human—not robotic. With multiple voices, languages, and low-latency streaming, TTS-1 redefines the synthetic voice experience.
- App Developers & Startups: Add lifelike voice to apps, from productivity tools to storytelling platforms.
- Conversational AI Creators: Build AI agents that speak fluently and naturally in real time.
- Voiceover & Media Teams: Generate narration, training content, or voiceovers without hiring voice actors.
- Accessibility Tool Builders: Support visually impaired users by reading content aloud with natural prosody.
- Game & Virtual World Designers: Give characters dynamic, believable voice lines at runtime.
- Educators & eLearning Platforms: Deliver engaging, spoken content for tutorials, lessons, and explainers.
🤖 How Does It Work?
- Step 1: Choose the API Endpoint: Use the /v1/audio/speech endpoint on OpenAI’s API platform.
- Step 2: Input Text & Select a Voice: Provide your input text and select from a set of high-quality voices like nova, shimmer, and more.
- Step 3: Get the Audio Output: The API returns high-quality audio in real time or as a downloadable file.
- Step 4: Integrate into Your App: Plug the audio into chat apps, e-learning platforms, storytelling tools, or wherever your users need voice.
Bonus: Streaming Option (TTS-1-HD): For ultra-low latency scenarios, the TTS-1-HD model supports streaming voice responses token-by-token.
- Human-Like Quality: TTS-1’s intonation, stress, and rhythm feel surprisingly real—perfect for dialogue and narration.
- Multiple High-Fidelity Voices: Choose from multiple distinct voice options that sound like different real people.
- Fast & Efficient: Latency is low, especially with TTS-1-HD for streaming. You can get usable speech almost instantly.
- Great for Conversational AI: It’s tightly integrated with GPT-4o, meaning your voice agent can think and talk smoothly.
- Emotionally Expressive: Subtle emotional shifts are captured for more compelling delivery.
- API-Based Delivery: No hardware or special software needed—just plug and play via API.
- Incredibly Realistic Voices: No robotic monotone—just smooth, human-sounding speech.
- Low Latency & Fast Output: Especially with streaming, responses are nearly instantaneous.
- Easy API Integration: Just a few lines of code to bring your app to life with voice.
- Voice Variety: Multiple high-quality options help match tone to use case.
- Plays Well with GPT-4o: Combine text and speech for seamless voice assistants.
- Limited Voice Customization: You can't yet fine-tune pitch, speed, or emotional tone beyond defaults.
- No Custom Voice Cloning: Currently, you're limited to OpenAI’s pre-set voice library.
- Language Support is Early-Stage: Multilingual capabilities are developing but not yet as strong as English.
- Pricing May Add Up at Scale: Frequent or long-form speech generation could be costly without optimization.
1 million tokens
$ 15.00
Output: Audio only
Endpoints: Speech generation (v1/audio/speech), plus support in Chat Completions, Responses, Realtime, Assistants, and Batch.
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Editorial Note
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