When was GPT-5.4 Mini released?

OpenAI released GPT-5.4 Mini on 17 Mar 2026. It is available through the Opper gateway.

Does GPT-5.4 Mini support zero data retention?

With abuse monitoring, yes. On Azure, OpenAI through the Opper gateway, prompts and outputs are not used for training and are kept only for abuse monitoring, for up to 30 days.

Where is GPT-5.4 Mini hosted?

GPT-5.4 Mini runs on both EU and US hosting routes through the Opper gateway. Pick the route that matches your residency requirement.

Is GPT-5.4 Mini trained on prompts and outputs?

No. Every hosting route for GPT-5.4 Mini is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for GPT-5.4 Mini?

Yes. A GDPR Data Processing Agreement is available on at least one route serving GPT-5.4 Mini. Contact hello@opper.ai to receive it.

GPT-5.4 Mini

by OpenAI

All OpenAI releases

GPT-5.4 Mini significantly improves over GPT-5 Mini across coding, reasoning, multimodal understanding, and tool use, while running more than 2x faster. With a 400k token context window and vision support, it approaches the performance of the larger GPT-5.4 on evaluations including SWE-Bench Pro and OSWorld-Verified. Built for high-volume workloads where latency shapes the user experience, GPT-5.4 Mini works well as the primary model for responsive coding assistants, quick-turnaround subagents, computer-use systems that interpret screenshots, and multimodal applications reasoning over images. The model supports structured output, function calling, and tool use for integration with complex workflows. OpenAI positions it as its strongest mini model for coding, computer use, and agentic tasks that demand both speed and capability.

Call GPT-5.4 Mini on Opper with the OpenAI SDK. Sign up without a credit card. Get started

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Key info

Input

Output

Features

Context window

400K

Max output

128K

Input price

$0.75 /1M$0.07 cache read

Output price

$4.50 /1M

Released

17 Mar 2026

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

Available routes

GPT-5.4 Mini runs on 2 different routes 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	$0.75	$4.50	$0.07
OpenAI	US		No	$0.75	$4.50	$0.07

Uptime and availability

GPT-5.4 Mini runs on 2 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.

100%effective uptime, last 30 days

Averaged across these routes on their own, a single provider reached 97.31% over the same window.

Daily status through the gateway, which serves each request from whichever route is healthy.

2 monitored providers serve GPT-5.4 Mini.

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-5.4 Mini 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

OpenAI — United States🇺🇸

Zero data retention with abuse monitoring: prompts and outputs are kept for up to 30 days for abuse monitoring only, and are not used for training. No training on customer data. US; SCCs; DPA available.

Zero data retention: With abuse monitoring, 30-day window.
Training: No training on customer data.
Logging: Abuse monitoring (30-day retention)
Abuse monitoring: On by default, holds flagged content, 30 days, a person can view samples
Caching: Content cached for replay
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#158 of 665 LLMs

TierEfficient

Intelligence Index24.1

Coding Index56.1

Reasoning & knowledge

GPQA Diamond

88%

Humanity's Last Exam

28%

Long-context reasoning

77%

Coding

SciCode

52%

Agentic & tool use

Terminal-Bench Hard

52%

τ²-Bench Telecom

83%

Math & instruction following

IFBench

73%

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

Get started

Call GPT-5.4 Mini through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

GPT-5.4 Mini 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: "openai/gpt-5.4-mini",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);