When was Step 3.7 Flash released?

StepFun released Step 3.7 Flash on 29 May 2026. It is available through the Opper gateway.

Does Step 3.7 Flash support zero data retention?

Yes. Step 3.7 Flash is available with zero data retention on Novita through the Opper gateway.

Where is Step 3.7 Flash hosted?

Step 3.7 Flash runs on US hosting routes through the Opper gateway.

Is Step 3.7 Flash trained on prompts and outputs?

No. Every hosting route for Step 3.7 Flash is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for Step 3.7 Flash?

Yes. A GDPR Data Processing Agreement is available on at least one route serving Step 3.7 Flash. Contact hello@opper.ai to receive it.

Step 3.7 Flash

by StepFun

Released 57 days after Step 3.5 Flash · All StepFun releases

Step 3.7 Flash brings StepFun's Step series down to a high-efficiency footprint, released as open weights in May 2026. The model is a sparse mixture-of-experts design that activates roughly 11 billion of its 198 billion total parameters per token and pairs the language backbone with a compact vision encoder, adding native image input that the earlier 3.5 Flash generation lacked. Selectable reasoning levels let callers trade depth for speed on each request, and the model is tuned for agent frameworks with reliable tool calling, MCP support, and structured output. It suits coding agents, search and retrieval workflows, and screenshot-driven automation that want capable multimodal behavior at small-model inference cost, backed by a 262K context window and outputs up to 256K tokens.

Call Step 3.7 Flash 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

262K

Max output

256K

Input price

$0.20 /1M$0.04 cache read

Output price

$1.15 /1M

Released

29 May 2026

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

Available routes

Step 3.7 Flash 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
Novita	US		No	$0.20	$1.15	$0.04

Live routes and prices as JSON: api.opper.ai/v3/models?q=novita%2Fstepfun%2Fstep-3.7-flash

Uptime and availability

Step 3.7 Flash 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 Step 3.7 Flash 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

Benchmarks

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

Global rank#232 of 681 LLMs

TierEfficient

Intelligence Index19.5

Coding Index39.6

Reasoning & knowledge

GPQA Diamond

81%

Humanity's Last Exam

21%

Long-context reasoning

74%

Coding

SciCode

44%

Agentic & tool use

Terminal-Bench Hard

36%

τ²-Bench Telecom

99%

Math & instruction following

IFBench

67%

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

Get started

Call Step 3.7 Flash through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

Step 3.7 Flash 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: "novita/stepfun/step-3.7-flash",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);