stepfun

Step 3.7 Flash

Input / 1M: $0.21
Output / 1M: $1.2075
Context: 256,000 tokens
Catalog: Gateway catalog

About this model

StepFun’s flagship multimodal reasoning model. Powered by a 198B-parameter / 11B-activation sparse MoE architecture, with native support for image and video understanding.

Replaces StepFun 3.5 Flash: input $0.0945 → $0.21 per 1M (+122%), output $0.315 → $1.2075 per 1M (+283%), context 262K → 256K, max output 262K → 256K.

text inputimage inputtext outputlanguage

Use with MiniRouter View docs

Use an endpoint supported by this model.

Get a key for this setup →

1const response = await fetch('https://api.minirouter.sh/v1/chat/completions', {2  method: 'POST',3  headers: {4    Authorization: `Bearer ${process.env.MINIROUTER_KEY}`,5    'Content-Type': 'application/json',6  },7  body: JSON.stringify({8    model: 'stepfun/step-3.7-flash',9    messages: [{ role: 'user', content: 'Why is the sky blue?' }],10    max_tokens: 1024,11  }),12})13 14const data = await response.json()15console.log(data.choices[0].message.content)

Read docs →

Overview

Model type: language
Context window: 256,000
Maximum output: 256,000
Input / 1M tokens: $0.21
Output / 1M tokens: $1.2075
Released: 2026-05-28

Prices include the MiniRouter fee. Compatibility snapshot: 2026-08-06. Input: text, image. Output: text.

Endpoints

/v1/chat/completions/v1/messages/v1/responses

Platform-funded routing only. Caller BYOK credentials and OIDC-based upstream authentication are intentionally excluded; authenticate with a MiniRouter bearer key.

Captured parameters: max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning.

Structured output: Not enforced; a requested format is dropped and the answer is plain text. How it works

API

Use the setup panel above to switch between Chat Completions, Messages, and client configurations. Every snippet keeps the model ID unchanged.

Base URLhttps://api.minirouter.sh/v1

Model IDstepfun/step-3.7-flash

Providers

MiniRouter selects from the configured routes below. Priority is the catalog order, not a latency or availability score.

Provider	Priority	Input / 1M	Output / 1M	Parameters	Access
vercel	1	$0.21	$1.2075	max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning	MiniRouter balance