gpt-realtime-1.5 by OpenAI

Name: gpt-realtime-1.5 by OpenAI
Brand: gpt-realtime-1.5

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Enable low-latency, multimodal AI interactions for voice agents and real-time audio transcription.

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Tracked since2026

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The Bottom Line

Entry price

Paid plans only

Biggest pro

Enables highly responsive and natural voice agent experiences.

Biggest con

Requires API key management and security best practices.

TL;DR - gpt-realtime-1.5 by OpenAI

Enables low-latency speech-to-speech and multimodal AI interactions.
Supports building voice agents in browsers, server-side, and VoIP telephony.
Offers real-time audio transcription capabilities.

Pricing: Paid only

Best for: Enterprises & pros

What is gpt-realtime-1.5 by OpenAI?

Editorial review

The OpenAI Realtime API, including the gpt-realtime-1.5 model, facilitates low-latency communication with AI models that support speech-to-speech interactions and multimodal inputs (audio, images, text) and outputs (audio, text). It is primarily designed for developers looking to build highly responsive voice agents, enabling natural, real-time conversations in applications. This API is ideal for browser-based voice agents using the Agents SDK for TypeScript, server-side applications requiring consistent low-latency with WebSocket, and VoIP telephony connections via SIP. Beyond voice agents, it also offers real-time audio transcription capabilities. Developers can manage conversation lifecycles, control sessions server-side with webhooks, and optimize costs, making it a versatile tool for integrating advanced real-time AI into various platforms.

Available on: Web

LCLouis CorneloupUpdated May 26, 2026 · how we evaluateSourcedevelopers.openai.com ↗

Pros & Cons

Pros

Enables highly responsive and natural voice agent experiences.
Flexible connection methods (WebRTC, WebSocket, SIP) cater to diverse use cases.
Supports multimodal interactions for richer AI applications.
Provides an SDK for quick development of browser-based voice agents.
Offers detailed guides for prompting, conversation management, and cost optimization.

Cons

Requires API key management and security best practices.
Usage is billed per token, which requires cost monitoring and optimization.
Migration from beta to GA interface involves specific changes.

Preview

Key Features

Low-latency speech-to-speech interactionsMultimodal input support (audio, images, text)Multimodal output support (audio, text)Real-time audio transcriptionAgents SDK for TypeScript for browser-based voice agentsWebRTC connection for client-side interactionsWebSocket connection for server-side applicationsSIP connection for VoIP telephony

Pricing

Paid

gpt-realtime-1.5 by OpenAI offers paid plans. Visit their website for current pricing details.

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gpt-realtime-1.5 by OpenAI FAQ

What is gpt-realtime-1.5 by OpenAI?

gpt-realtime-1.5 is a model within the OpenAI Realtime API designed for low-latency communication, enabling speech-to-speech interactions and multimodal inputs/outputs. It's used for building voice agents and real-time audio transcription.

How much does gpt-realtime-1.5 by OpenAI cost?

For the Standard tier, gpt-realtime-1.5 costs $4.00 per 1M input text tokens, $0.40 per 1M cached input text tokens, and $16.00 per 1M output text tokens. For image tokens, it costs $5.00 per 1M input tokens and $0.50 per 1M cached input tokens. For audio tokens, it costs $32.00 per 1M input tokens, $0.40 per 1M cached input tokens, and $64.00 per 1M output tokens.

Is gpt-realtime-1.5 by OpenAI free?

No, gpt-realtime-1.5 by OpenAI is not free. It is a paid service with usage-based pricing for text, image, and audio tokens.

Who is gpt-realtime-1.5 by OpenAI for?

gpt-realtime-1.5 by OpenAI is for developers, machine learning engineers, and organizations looking to build real-time voice agents, integrate speech-to-speech AI into applications, or perform real-time audio transcription. It's suitable for both client-side (browser) and server-side applications, as well as VoIP telephony connections.

Source: developers.openai.com