Does GPT-5.1 Codex support zero data retention?

Not self-serve on Pay-as-you-go. Zero data retention for GPT-5.1 Codex is available on request via Opper Enterprise — contact hello@opper.ai.

Where is GPT-5.1 Codex hosted?

GPT-5.1 Codex runs on US hosting routes through the Opper gateway.

Is GPT-5.1 Codex trained on prompts and outputs?

No. Every hosting route for GPT-5.1 Codex is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for GPT-5.1 Codex?

Yes. A GDPR Data Processing Agreement is available on at least one route serving GPT-5.1 Codex. Contact hello@opper.ai to receive it.

GPT-5.1 Codex

by OpenAI

GPT-5.1 Codex is a code-tuned variant of GPT-5.1 with a 272,000-token context window, aimed at software development and code-heavy tasks. It handles code generation, refactoring, debugging, and reasoning over large codebases. The model supports function calling and structured outputs, so it integrates with development tools and automated code workflows. Its large context window lets it work across many files and keep changes consistent within a project.

Open in playground Try in chat Compare

Key info

Input

Output

Features

Context window

272K

Max output

128K

Input price

$1.25 /1M

Output price

$10.00 /1M

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

Available routes

GPT-5.1 Codex 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
OpenAI	US	Enterprise	No	$1.25	$10.00

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

Data handling per route

Each route hosting GPT-5.1 Codex 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 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

Benchmarks

Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#63 of 531 LLMs

TierStrong

Output speed187 tok/s

First token5.30s

Intelligence Index34.7

Coding Index36.6

Math Index95.7

Reasoning & knowledge

MMLU-Pro

86%

GPQA Diamond

86%

Humanity's Last Exam

23%

Long-context reasoning

67%

Coding

LiveCodeBench

85%

SciCode

40%

Agentic & tool use

Terminal-Bench Hard

35%

τ²-Bench Telecom

83%

Math & instruction following

AIME 2025

96%

IFBench

70%

See full leaderboard →Benchmarks via Artificial Analysis · View on AA

Get started

Call GPT-5.1 Codex 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: "openai/gpt-5.1-codex",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);