GPT Realtime

by OpenAI

GPT Realtime is OpenAI's first generally available realtime model, responding to audio and text inputs in real time for speech-to-speech interactions. It supports function calling for agentic voice workflows. The model operates with a 32,000 token context window and up to 4,096 output tokens, tuned for low-latency voice experiences such as customer support and voice agents. Its knowledge cutoff is October 1, 2023.

Call GPT Realtime on Opper with the OpenAI SDK. Sign up without a credit card. Get started

Key info

Input
Output
Features
Context window
—
Max output
—
Input price
$4.00 /1M$0.40 cache read
Output price
$24.00 /1M
  • US residency available
  • Zero data retention with abuse monitoring
  • No training by default
  • GDPR DPA available

Available routes

GPT Realtime runs on 1 route through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.

ProviderRegionZero data retentionTrainingInputOutputCache read
USNo$4.00$24.00$0.40

Uptime and availability

GPT Realtime runs on a single route through the Opper gateway today, so its availability is that provider's availability.

94.61%route uptime, last 30 days
Single route, no failover target within this model.

Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.

Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.

Data handling per route

Each route hosting GPT Realtime has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

OpenAI — United States🇺🇸

Zero data retention with abuse monitoring: prompts and outputs are kept for up to 30 days for abuse monitoring only, and are not used for training. No training on customer data. US; SCCs; DPA available.

Zero data retention
With abuse monitoring, 30-day window.
Training
No training on customer data.
Logging
Abuse monitoring (30-day retention)
Abuse monitoring
On by default, holds flagged content, 30 days, a person can view samples
Caching
Content cached for replay
GDPR DPA
DPA available
Transfer mechanism
SCCs

Get started

Call GPT Realtime through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

GPT Realtime is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.OPPER_API_KEY,
baseURL: "https://api.opper.ai/v3/compat",
});
const completion = await client.chat.completions.create({
model: "openai/gpt-realtime",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Compare GPT Realtime with…

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