The intelligence of ChatGPT, now in voice form. GPT-4o native audio processing with 8 premium voices, real-time function calling, and complex reasoning capabilities. Build voice assistants that truly understand.
Model Power
Premium Voices
Response Time
Function Calling
What makes OpenAI Realtime special
The full reasoning capabilities of GPT-4o, now in voice. Handle complex queries, multi-step reasoning, and nuanced conversations.
Alloy, Ash, Ballad, Coral, Echo, Sage, Shimmer, and Verse. Each voice crafted for different use cases and brand personalities.
Direct audio-to-audio without STT/TTS conversion. More natural conversations with lower latency.
Execute API calls, database queries, and business logic during live calls. Real actions, not just conversations.
Intelligent voice activity detection handled by OpenAI servers. Natural turn-taking without manual configuration.
Maintains conversation context across multiple turns. References previous statements, tracks intent, resolves complex queries.
Each voice designed for specific use cases and brand personalities
Alloy
Professional
Neutral, balanced voice. Best for general use cases.
Ash
Friendly
Warm, conversational tone. Great for customer support.
Ballad
Caring
Soft, expressive voice. Ideal for empathetic interactions.
Coral
Confident
Clear, professional voice. Perfect for business calls.
Echo
Energetic
Dynamic, engaging voice. Great for sales and marketing.
Sage
Wise
Calm, thoughtful voice. Best for advisory and support.
Shimmer
Cheerful
Bright, friendly voice. Ideal for hospitality.
Verse
Adaptable
Versatile, natural voice. Works across use cases.
Listen to all voices in our interactive demo
Try Voice DemoChoose based on your quality and cost requirements
| Feature | OpenAI Realtime | OpenAI Realtime Mini |
|---|---|---|
| Model | gpt-4o-realtime-preview | gpt-4o-mini-realtime-preview |
| Reasoning Quality | Premium | Good |
| Voices Available | 8 (All voices) | 8 (Same voices) |
| Audio Format | 24kHz PCM16 | 24kHz PCM16 |
| Function Calling | Yes | Yes |
| Server VAD | Yes | Yes |
| Cost (Our Platform) | Rs 12/min | Rs 6/min |
| Best For | Complex reasoning, premium CX | Cost-effective, simpler queries |
Execute APIs and business logic during live conversations
Customer
"I want to reschedule my appointment from Tuesday to Thursday afternoon."
→ Available slots: 2:00 PM, 3:30 PM, 4:00 PM
AI (Coral voice)
"I can reschedule you to Thursday afternoon. I have three slots available: 2 PM, 3:30 PM, or 4 PM. Which works best for you?"
Customer
"3:30 works."
→ Appointment rescheduled. Confirmation sent.
AI (Coral voice)
"Done! I've rescheduled your appointment to Thursday at 3:30 PM. I've also sent a confirmation to your email and phone. Is there anything else I can help with?"
ChatGPT intelligence for voice interactions
ChatGPT-Level Intelligence
Complex queries handled effortlessly
Natural Conversations
No robotic responses or scripts
Actions Completed
Bookings, lookups, updates - all in call
Premium Voice Quality
8 carefully crafted voices
OpenAI Reliability
Enterprise-grade infrastructure
Complex Use Cases
Handle what other AI can't
Real-Time Integration
APIs called during conversations
Brand Consistency
Choose voice that matches brand
From voice input to intelligent response
Voice Input
Customer speaks naturally
GPT-4o Processing
Native audio understanding
Function Execution
APIs called if needed
Natural Response
Premium voice output
Real results from GPT-4o powered voice AI
"Complex technical support queries that stumped our old bot are now handled seamlessly. GPT-4o's reasoning is on another level."
85% First-Call Resolution
Bangalore
Support Lead
"The Coral voice is perfect for our brand. Professional, confident, trustworthy. Customers think they're talking to a real person."
4.7/5 Voice Quality
Mumbai
CX Manager
"Function calling during the call is a game-changer. Appointment bookings, account lookups, payments - all in one conversation."
Zero Manual Work
Delhi
Admin
Common questions about GPT-4o voice integration
OpenAI Realtime is OpenAI's native audio API that lets GPT-4o process voice directly without converting to text first. This means faster responses, more natural conversations, and the ability to understand tone and nuance. It's essentially ChatGPT in voice form.
Regular GPT-4o requires converting speech to text (STT), processing with GPT, then converting back to speech (TTS). OpenAI Realtime processes audio directly, eliminating conversion delays and preserving audio nuances like tone and emphasis. It's faster and more natural.
For customer support, use Ash (warm) or Sage (calm). For sales, Echo (energetic) or Coral (confident) work well. For general use, Alloy (neutral) or Verse (versatile) are safe choices. Healthcare and empathy-focused use cases work best with Ballad. We can help you test and choose.
Yes! This is one of the most powerful features. The AI can call your APIs mid-conversation to check order status, book appointments, update CRM, process payments, or any other action. The conversation pauses briefly for the API call then continues naturally.
OpenAI Realtime uses the full GPT-4o model for premium quality reasoning. Realtime Mini uses GPT-4o-mini for cost-effective deployment. Mini is about 75% cheaper but with slightly less sophisticated reasoning. Both have the same 8 voices and native audio capabilities.
On our platform, OpenAI Realtime is Rs 12/minute (full GPT-4o) or Rs 6/minute (Mini). This includes the OpenAI API costs, our platform, and telephony. It's more expensive than standard voice AI but delivers ChatGPT-quality conversations.
OpenAI Realtime primarily excels in English but supports multiple languages. For Indian languages like Hindi, Tamil, or Telugu, we recommend Gemini Live 2.5 HD which has native support. OpenAI Realtime is best for English-primary use cases with occasional Hindi-English code-switching.
Yes, OpenAI provides enterprise-grade reliability. We also have fallback options - if OpenAI Realtime is unavailable, we can switch to Gemini Live or standard STT+GPT+TTS pipelines. Your voice agents keep running regardless of any single provider's status.
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Open in DriveBest AI voice agent pricing worldwide - from ₹4/min ($0.04) | 40% more affordable than US alternatives