ChatTTS vs OpenAI Realtime API

Comparing the features of ChatTTS to OpenAI Realtime API

Feature
ChatTTS
OpenAI Realtime API

Capability Features

Community Support
Continuous Improvement
Controllability and Security
Detailed Documentation
Dialog Task Optimization
Easy to Use
Enterprise Privacy Commitment
Expanded Model Support Planned
Fine-tuning Supported
Five New Voices
5
Full Model Training Hours
100000
Function Calling
High-Fidelity Speech Synthesis
Human and Automated Safety Monitoring
Interruption Handling
Multilingual Support
ChineseEnglish
No Training on Data Without Permission
Open Source
Open Source Model Training Hours
40000
Playground Access
Prompt Caching Planned
Public Beta
Reference Client Available
Sample Rate for Audio Output
24000
Six Preset Voices
6
Speech-to-Speech
Streaming Audio Inputs/Outputs
Supports Text and Audio Inputs
TextAudio
Text to Speech
Ultra Low Latency
Voice Customization Options
WebSocket Connection

Integration Features

Agora Integration
API Integrations
Chat Completions API Integration
Gradio Demo Integration
LiveKit Integration
OpenAI Node.js SDK Planned
OpenAI Python SDK Planned
Platform Compatibility
Web applicationsMobile appsDesktop softwareEmbedded systems
PyTorch Dependency
SDK Programming Language Support
Multiple programming languages
Supports GPT-4o
gpt-4o-realtime-preview
Twilio Voice API Integration

Limitation Features

AI Disclosure Requirement
Audio Only Modality (Initially)
Lower Session Limits Tiers 1-4
Lower than 100
No Simultaneous Session Limit Anymore
Not All Languages Supported
Requires Significant Compute
High computational resources needed
Simultaneous Sessions Limit Tier 5
100
Speech Quality Depends on Input
Varies with text complexity and length
Usage Policy Restriction

Pricing Features

Approximate Audio Input Price
$0.06/minute
Approximate Audio Output Price
$0.24/minute
Free Tier
No Explicit Paid Plans Shown
No Free Tier
Pricing Audio Input
$100/1M tokens
Pricing Audio Output
$200/1M tokens
Pricing Cached Audio Input
$20/1M tokens
Pricing Cached Text Input
$2.50/1M tokens
Pricing Text Input
$5/1M tokens
Pricing Text Output
$20/1M tokens