GPT Realtime
GPT Realtime is OpenAI's flagship model designed for real-time voice conversations, supporting both text and audio input/output with a 128K token context window.
API Pricing
Cheapest on OpenAI — 40% below avg| Provider | Input / 1M | Output / 1M | Updated |
|---|---|---|---|
| $2.00 | $8.00 | 4/14/2026 | |
| $4.00 | $16.00 | 4/9/2026 | |
| $4.00 | $16.00 | 4/14/2026 |
Prices updated daily. Last check: 4/14/2026
Model Details
General
- Creator
- OpenAI
- Family
- GPT Realtime
- Tier
- Flagship
- Context Window
- 128K
- Knowledge Cutoff
- Oct 2024
- Modalities
- Text, Audio
Capabilities
- Tool Calling
- Yes
- Open Source
- No
- Subtypes
- Chat Completion
Strengths & Limitations
- Native real-time audio input and output processing without separate TTS conversion
- 128,000 token context window for extended conversation memory
- Tool calling support enables API integration during voice conversations
- Optimized for low-latency voice interactions and natural conversation flow
- October 2024 knowledge cutoff provides relatively current information
- Flagship-tier reasoning capabilities applied to voice-based interactions
- Supports both text and audio modalities for flexible integration
- Limited to audio and text modalities - no image or video input support
- Proprietary model with no open-source weights available
- Smaller context window compared to some competing flagship models
- Specialized for voice use cases may not optimize for pure text tasks
- Knowledge cutoff older than some competing models released in 2025-2026
Key Features
About GPT Realtime
Common Use Cases
GPT Realtime is designed for applications requiring immediate voice interaction capabilities, making it well-suited for voice assistants, real-time customer service systems, and interactive voice response applications. Its tool calling functionality enables voice-activated workflows that can integrate with external APIs and databases during conversations. The model excels in scenarios where conversation flow and response timing are critical, such as phone-based support systems, voice-controlled smart home devices, and real-time language practice applications. Its flagship-tier reasoning capabilities make it appropriate for complex voice-based queries that require multi-step thinking, while the 128K context window allows for extended conversations with maintained context.
Frequently Asked Questions
How much does GPT Realtime cost per million tokens?
GPT Realtime pricing varies by provider and usage type (audio vs text tokens may be priced differently). Check the pricing table above for current rates across all providers offering GPT Realtime access.
What is GPT Realtime best used for?
GPT Realtime is optimized for real-time voice conversations and applications requiring immediate audio response. It excels in voice assistants, customer service systems, phone-based support, and any scenario where natural conversation flow and low latency are important.
How does GPT Realtime differ from using GPT-4 with text-to-speech?
GPT Realtime processes audio natively without requiring separate text-to-speech conversion, resulting in lower latency and more natural conversation flow. It's specifically optimized for real-time voice interactions rather than text generation that gets converted to speech afterward.