Does Step 5 Preview support zero data retention?

Yes. Step 5 Preview is available with zero data retention on Novita, Tencent Cloud through the Opper gateway.

Where is Step 5 Preview hosted?

Step 5 Preview runs on US hosting routes through the Opper gateway.

Is Step 5 Preview trained on prompts and outputs?

No. Every hosting route for Step 5 Preview is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for Step 5 Preview?

Yes. A GDPR Data Processing Agreement is available on at least one route serving Step 5 Preview. Contact hello@opper.ai to receive it.

Step 5 Preview

by StepFun

Step 5 Preview is the new flagship model from StepFun, the Shanghai AI lab. It is a sparse mixture-of-experts model with 600B total parameters, of which 27B are active per token. StepFun positions it for agentic work, targeting frontier-level performance in software engineering and professional knowledge work, with particular strength in finance. The model accepts text, images and video as input and returns text. It has a 1M-token context window and can produce up to 64k output tokens, so it can hold a large codebase, a long document set or an extended agent history in one conversation. It supports tool calling, JSON Schema structured output and streaming, and it reasons before answering. As a preview release, its behavior and availability may change before a final version.

Call Step 5 Preview 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

Max output

64K

Input price

$1.00 /1M$0.10 cache read

Output price

$2.70 /1M

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

Available routes

Step 5 Preview 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
Novita	US		No	$1.00	$2.70	$0.10
Tencent Cloud	Multi		No	$1.00	$2.70	$0.05

Live routes and prices as JSON: api.opper.ai/v3/models?q=step-5-preview

Uptime and availability

One of Step 5 Preview's 2 routes is on the monitoring board, so the figure below is that provider's availability rather than the model's.

100%route uptime, last 30 days

Its other routes aren't measured here yet.

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. 1 further route is not on the board yet. See uptime for every provider Opper monitors.

Data handling per route

Each route hosting Step 5 Preview has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Novita — United States🇺🇸

Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. US; SCCs; DPA available.

Zero data retention: Yes. Nothing is logged, held for abuse monitoring or used for training.
Training: No training on customer data.
Logging: None
Abuse monitoring: On by default, keeps nothing
GDPR DPA: DPA available
Transfer mechanism: SCCs

Tencent Cloud — Multi-region

Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. GLOBAL; SCCs; DPA available.

Zero data retention: Yes. Nothing is logged, held for abuse monitoring or used for training.
Training: No training on customer data.
Logging: None
Abuse monitoring: On by default, keeps nothing
Caching: Content cached for replay
GDPR DPA: DPA available
Transfer mechanism: SCCs

Get started

Call Step 5 Preview through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

Step 5 Preview 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: "step-5-preview",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);