Hume AI vs OpenAI Realtime API

Comparing the features of Hume AI to OpenAI Realtime API

Feature
Hume AI
OpenAI Realtime API

Capability Features

Conversational AI
Emotion Instruction
Enterprise Privacy Commitment
Expanded Model Support Planned
Five New Voices
5
Function Calling
Game and AI Character Use Case
High Quality Voice
Human and Automated Safety Monitoring
Interruption Handling
Languages Supported
EnglishJapaneseKoreanSpanishFrenchPortugueseItalianGermanRussianHindiArabic
Latency
<200ms
LLM-Powered TTS
Media Creation Use Case
Multimodal AI
No Training on Data Without Permission
Phone Call Use Case
Playground Access
Prompt Caching Planned
Public Beta
Reference Client Available
Six Preset Voices
6
Speech-to-Speech
Speech-to-Speech API
Streaming Audio Inputs/Outputs
Supports Text and Audio Inputs
TextAudio
Text to Speech
Ultra Low Latency
Voice Cloning
Voice Design
WebSocket Connection

Integration Features

Agora Integration
API Integration With LLMs
HumeClaude Sonnet 4.5Grok 4 FastGPT 5+20 more
Chat Completions API Integration
Developer SDKs
Python SDKTypescript SDKSwift SDKReact SDKC# SDK
LiveKit Integration
OpenAI Node.js SDK Planned
OpenAI Python SDK Planned
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
Simultaneous Sessions Limit Tier 5
100
Text Input Limit
500
Usage Policy Restriction

Pricing Features

Approximate Audio Input Price
$0.06/minute
Approximate Audio Output Price
$0.24/minute
Free Tier
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