Does Rumble 2 Realtime support zero data retention?

Yes. Rumble 2 Realtime is available with zero data retention on Reson8 through the Opper gateway.

Where is Rumble 2 Realtime hosted?

Rumble 2 Realtime runs on EU hosting routes through the Opper gateway, with contractually enforced residency on supported providers.

Is Rumble 2 Realtime trained on prompts and outputs?

No. Every hosting route for Rumble 2 Realtime is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for Rumble 2 Realtime?

Yes. A GDPR Data Processing Agreement is available on at least one route serving Rumble 2 Realtime. Contact hello@opper.ai to receive it.

Rumble 2 Realtime

by Reson8

Rumble 2 Realtime transcribes live audio over a WebSocket in ten European languages, sending interim transcripts as the speaker talks and a final transcript per segment, with optional speaker labels and word timings. With semantic turn detection it runs on Reson8 Turns, which judges the end of a speaker's turn from what was said as well as from pauses, so a voice agent can start its reply early. It takes 16 kHz PCM or 8 kHz phone audio (mu-law and A-law).

Call Rumble 2 Realtime on Opper over the realtime WebSocket. Sign up without a credit card. Get started

Get your API key Try in chat Compare

Key info

Input

Output

Features

Pricing

from $0.0004 / min

Billing

Per minute

EU residency available
Zero data retention on pay-as-you-go
No training by default
GDPR DPA available

Pricing

Usage-based pricing, billed by the minute and tiered by variant, not by token.

Variant	Price
Input	$0.0045 / min
diarization	$0.0004 / min

Available routes

Rumble 2 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. In the EU it is served by Reson8 (Netherlands). See every model hosted in the EU.

Provider	Region	Zero data retention	Training	Price
Reson8	EU		No	from $0.0004 / min

Live routes and prices as JSON: api.opper.ai/v3/models?q=reson8%2Frumble-2-realtime

Data handling per route

Each route hosting Rumble 2 Realtime has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Reson8 — Netherlands🇳🇱

Zero data retention: nothing is logged or used for training. No training on customer data. EU; DPA available.

Zero data retention: Yes. Nothing is logged or used for training.
Training: No training on customer data.
Logging: None
Subprocessor access: No subprocessor reads content
GDPR DPA: DPA available
Transfer mechanism: Not applicable — data stays in EU

Get started

Call Rumble 2 Realtime through the Opper gateway with one API key. Realtime models run over a WebSocket at wss://api.opper.ai/v3/realtime: open it, send session.start with this model, then stream audio both ways.

See the Opper realtime quickstart, the realtime protocol and the Opper multimodal skill.

Rumble 2 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

1import WebSocket from "ws";
2
3const ws = new WebSocket("wss://api.opper.ai/v3/realtime", {
4  headers: { Authorization: `Bearer ${process.env.OPPER_API_KEY}` },
5});
6
7ws.on("open", () => {
8  ws.send(JSON.stringify({
9    type: "session.start",
10    config: {
11      model: "reson8/rumble-2-realtime",
12      instructions: "You are a concise voice assistant.",
13    },
14  }));
15});
16
17// Stream microphone audio in with { type: "audio.append", audio: <base64 PCM16> }
18ws.on("message", (raw) => {
19  const ev = JSON.parse(raw.toString());
20  if (ev.type === "audio.delta") {
21    // ev.audio is base64 PCM16: play it
22  }
23});