GPT-4o Mini Realtime

by OpenAI

GPT-4o Mini Realtime is the smaller, faster member of OpenAI's realtime voice family, built for interactive, low-latency conversations. It is a native speech-to-speech model, taking audio in and producing spoken responses directly rather than chaining separate transcription and synthesis steps. It supports function calling, so voice agents can invoke external APIs mid-conversation, and voice activity detection helps it respond promptly without processing silence. Its smaller size keeps cost and latency low, which fits customer service bots, voice assistants, and hands-free applications where responsiveness matters more than maximum reasoning depth.

Key info

Input
Output
Features
Context window
β€”
Max output
β€”
Input price
$0.60 /1M
Output price
$2.40 /1M
  • US residency available
  • Zero data retention via Enterprise
  • No training by default
  • GDPR DPA available

Available routes

GPT-4o Mini Realtime runs on 1 route through the Opper gateway. Compare residency, ZDR, and training posture at a glance β€” full data-handling detail per route below.

ProviderRegionZero data retentionTrainingInputOutput
OpenAIUSEnterpriseNo$0.60$2.40

Training posture across routes: No training on prompts by default.

Data handling per route

Each route hosting GPT-4o Mini Realtime has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

OpenAI β€” United StatesπŸ‡ΊπŸ‡Έ

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
Abuse monitoring (30-day retention)
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
SCCs

Get started

Call GPT-4o Mini Realtime through the Opper gateway with one API key. Let your coding agent set it up, or call it directly β€” Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.

Set it up with your agent

Copy this and paste it into your coding agent β€” Claude Code, Cursor, Codex, and more β€” 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-4o-mini-realtime",
messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

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GPT-4o Mini Realtime by OpenAI β€” pricing, benchmarks | Opper AI