OpenAI Realtime API vs SpeechGen.io

Comparing the features of OpenAI Realtime API to SpeechGen.io

Feature
OpenAI Realtime API
SpeechGen.io

Capability Features

Adjustable Pitch
Adjustable Sample Rate
48000 Hz44100 Hz24000 Hz16000 Hz12000 Hz8000 Hz
Adjustable Speed
Audio to Text
Cloud History Save
Commercial Use Allowed
DOCx to Audio Conversion
Download After Generation
Emphasis Control
Enterprise Privacy Commitment
Expanded Model Support Planned
Favorites System
Five New Voices
5
Function Calling
Human and Automated Safety Monitoring
Interruption Handling
Intonation Adjustment
Maximum Text Length Per Query
2000000
Multi-Voice Feature
No Training on Data Without Permission
Partial Edit Re-dubbing
Pause Control
PDF to Audio Conversion
Playground Access
Prompt Caching Planned
Pronunciation Control
Public Beta
Reference Client Available
Six Preset Voices
6
Speech-to-Speech
SSML Tag Support
Streaming Audio Inputs/Outputs
Subtitle to Audio
Supports Text and Audio Inputs
TextAudio
Total Supported Languages
146
Ultra Low Latency
Video to Text
Voice Selection
AmeliaAndrewAvaBlueBrian WhiteDanielle plusDavisElijahEmma CoxEvelynGregory plusHollyHunterIvy plusJane SmithJasonJoanna plusJoey plusJohnJustin plusKaiKendra plusKimberly plusKolbyLuna BellMatthew plusNancyOliverRogerRuth plusSalli plusScottSimon USSkylerSteffanTonyJenniferHannaKelsyArnoldEllisJackFennyBartDenAngelGloryHelenIronJerryAveryGuyAmberAnnyAshleyBrandonChristopherCoraElizabethEricJacobJennyMichelleMonicaSaraKevin plusSalliJoannaIvyKendraKimberlyMatthewJustinJoeyAda USAdam USAlessio USAlloy USAmanda USAndrew USArabella USAva USBrandon USBrian USChristopher USCora USDavis USDerek USDustin USEcho USEmma USEvelyn USFable USFlorian USGiuseppe USHyunsu USIsabella USIsidora USJenny USLewis USLola USLucien USMacerio USMarcello USMasaru USNancy USNova USOllie USOnyx USPhoebe USRemy USRyan USSamuel USSeraphina USSerena USShimmer USSteffan USThalita USTristan USVivienne USXiaochen USXiaoxiao USXiaoyu USXimena USYunfan USYunxiao USYunyi US
WebSocket Connection
YT Transcribe

Integration Features

Agora Integration
API Access
Chat Completions API Integration
Export Formats
mp3wavoggopus
LiveKit Integration
OpenAI Node.js SDK Planned
OpenAI Python SDK Planned
Supports GPT-4o
gpt-4o-realtime-preview
Twilio Voice API Integration
Video Software Compatibility
Adobe PremierAfter effectsAuditionDaVinci ResolveApple MotionCamtasiaiMovieAudacity
WordPress Plugin

Limitation Features

AI Disclosure Requirement
Audio Only Modality (Initially)
Free Tier
Reference only, limited features
Limits by Character Count
Lower Session Limits Tiers 1-4
Lower than 100
No Simultaneous Session Limit Anymore
No Subscription
Simultaneous Sessions Limit Tier 5
100
Usage Policy Restriction

Pricing Features

Approximate Audio Input Price
$0.06/minute
Approximate Audio Output Price
$0.24/minute
Audio Character Limit
4000
Free Characters With Registration
2000
Free Characters Without Registration
1000
No Free Tier
One-Time Payment Option
Pay-as-you-go Plan
Premium Voice Character Limit
2000
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 Per 1000 Characters
$0.08
Pricing Text Input
$5/1M tokens
Pricing Text Output
$20/1M tokens