Does GPT-5.3 Chat support zero data retention?

With abuse monitoring, yes. On Azure through the Opper gateway, prompts and outputs are not used for training and are kept only for abuse monitoring.

Where is GPT-5.3 Chat hosted?

GPT-5.3 Chat runs on EU hosting routes through the Opper gateway, with contractually enforced residency on supported providers.

Is GPT-5.3 Chat trained on prompts and outputs?

No. Every hosting route for GPT-5.3 Chat is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for GPT-5.3 Chat?

Yes. A GDPR Data Processing Agreement is available on at least one route serving GPT-5.3 Chat. Contact hello@opper.ai to receive it.

GPT-5.3 Chat

by OpenAI

GPT-5.3 Chat is a chat-tuned model in OpenAI's GPT-5.3 generation, with a 272,000-token context window for handling long conversations and documents. It pairs vision input, tool use, and structured outputs with conversational tuning for interactive settings. The large context window lets it stay consistent over long conversations, draw on conversation history, and produce answers grounded in extensive prior context.

Call GPT-5.3 Chat on Opper with the OpenAI SDK. Sign up without a credit card. Get started

Get your API key Try in chat Compare

Key info

Input

Output

Features

Context window

272K

Max output

128K

Input price

$1.75 /1M$0.17 cache read

Output price

$14.00 /1M

EU residency available
Zero data retention with abuse monitoring
No training by default
GDPR DPA available

Available routes

GPT-5.3 Chat 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.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
Azure	EU		No	$1.75	$14.00	$0.17

Uptime and availability

GPT-5.3 Chat runs on a single route through the Opper gateway today, so its availability is that provider's availability.

100%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-5.3 Chat has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Azure — Sweden🇸🇪

Zero data retention with abuse monitoring: nothing is logged or used for training; content flagged by abuse monitoring is held for review. No training on customer data. EU; DPA available.

Zero data retention: With abuse monitoring, flagged content held.
Training: No training on customer data.
Logging: None
Abuse monitoring: On by default, holds flagged content, stored in Sweden, a person can view samples
GDPR DPA: DPA available
Transfer mechanism: Not applicable — data stays in EU

Get started

Call GPT-5.3 Chat through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

GPT-5.3 Chat 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 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: "azure/gpt-5.3-chat",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);