GPT-Realtime-1.5
GPT-Realtime-1.5 is OpenAI's flagship audio model for voice agents and customer support, handling speech-to-speech conversation with stronger instruction following and more reliable tool calling than earlier realtime preview models.
import { gateway } from '@ai-sdk/gateway';
export async function POST() { const { token, url } = await gateway.experimental_realtime.getToken({ model: 'openai/gpt-realtime-1.5', });
return Response.json({ token, url, tools: [] });}Playground
Try out GPT-Realtime-1.5 by OpenAI. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.
GPT-Realtime-1.5Voice agent
Talk to a realtime agent. It listens to your voice and replies with audio.
Start the session and ask the agent something.
Providers
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
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About GPT-Realtime-1.5
GPT-Realtime-1.5 launched on February 23, 2026 as OpenAI's flagship realtime audio model for voice agents and customer support. Compared with earlier realtime preview models, GPT-Realtime-1.5 delivers stronger instruction following, more reliable tool calling, and better voice quality.
Speech-to-speech is the defining design choice. Rather than chaining transcription, a text model, and speech synthesis, GPT-Realtime-1.5 processes audio natively and responds in audio. That cuts latency and produces responses that sound more natural. Tool calling works during live conversation, so a voice agent can check a calendar or query a database while the caller is still talking.
GPT-Realtime-1.5 also enacts specified roles reliably, following instructions to hold a particular personality or tone. That consistency makes GPT-Realtime-1.5 practical for branded support experiences and scripted workflows at scale.
What To Consider When Choosing a Provider
- Configuration: Realtime support on AI Gateway is in beta through AI SDK 7. The integration is WebSocket-based: your server mints a short-lived token, and the browser connects with the AI SDK's realtime hook, which handles microphone capture and playback. Your AI Gateway API key never reaches the client.
- Zero Data Retention: AI Gateway does not currently support Zero Data Retention for this model. See the documentation for models that support ZDR.
- Authentication: AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.
When to Use GPT-Realtime-1.5
Best for
- Customer support agents: Script-following voice agents that answer, resolve, and escalate correctly
- Tool-calling voice workflows: Assistants that check calendars, query databases, or call APIs mid-conversation
- Low-latency voice interfaces: Native speech-to-speech avoids the delay of chained transcription and synthesis
- Role-consistent personas: Agents that hold a defined personality or tone across long sessions
Consider alternatives when
- Deeper reasoning required:
gpt-realtime-2adds configurable reasoning effort for complex voice workflows - Recorded audio transcription:
gpt-4o-transcribeandgpt-4o-mini-transcribeare built for speech-to-text jobs - Cost-sensitive voice features:
gpt-realtime-minihandles high-volume, simpler interactions at a lower rate
Conclusion
GPT-Realtime-1.5 is the production baseline for voice agents through AI Gateway: native speech-to-speech, reliable tool calling, and consistent instruction following. Build here first, and move specific workflows to gpt-realtime-2 when they need configurable reasoning.