Does GPT OSS 120B Fast support zero data retention?

Not self-serve on Pay-as-you-go. Zero data retention for GPT OSS 120B Fast is available on request via Opper Enterprise — contact hello@opper.ai.

Where is GPT OSS 120B Fast hosted?

GPT OSS 120B Fast runs on US hosting routes through the Opper gateway.

Is GPT OSS 120B Fast trained on prompts and outputs?

No. Every hosting route for GPT OSS 120B Fast is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for GPT OSS 120B Fast?

Yes. A GDPR Data Processing Agreement is available on at least one route serving GPT OSS 120B Fast. Contact hello@opper.ai to receive it.

GPT OSS 120B Fast

by OpenAI

GPT OSS 120B Fast is a latency-optimized configuration of GPT-OSS 120B, tuned for faster responses while keeping the same open-weight architecture and 117B-parameter Mixture-of-Experts design. It preserves the core strengths of GPT-OSS 120B, including reasoning, agentic tool use with function calling, and structured outputs, making it a fit for latency-sensitive applications that still need the full model's capability.

Open in playground Try in chat Compare

Key info

Input

Output

Features

Context window

131K

Max output

Input price

$0.10 /1M

Output price

$0.50 /1M

US residency available
Zero data retention via Enterprise
No training by default
GDPR DPA available

Available routes

GPT OSS 120B Fast runs on 1 route through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.

Provider	Region	Zero data retention	Training	Input	Output
Nebius	US	Enterprise	No	$0.10	$0.50

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

Data handling per route

Each route hosting GPT OSS 120B Fast has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Nebius — United States🇺🇸

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
Third-party access: None disclosed
GDPR DPA: DPA available
Transfer mechanism: SCCs

Get started

Call GPT OSS 120B Fast through the Opper gateway with one API key. Let your coding agent set it up, or call it directly — 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 — Claude Code, Cursor, Codex, and more — and it'll wire up Opper for you.

Or call it directly

1import OpenAI from "openai";
2
3const client = new OpenAI({
4  apiKey: process.env.OPPER_API_KEY,
5  baseURL: "https://api.opper.ai/v3/compat",
6});
7
8const completion = await client.chat.completions.create({
9  model: "nebius/gpt-oss-120b-fast",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);