Step 3.7 Flash

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.

Model by StepFun

IndexedLicense unknown

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{
  "model": "stepfun/step-3.7-flash",
  "baseURL": "https://openrouter.ai/api/v1"
}

OpenAI-compatible API: point any OpenAI SDK at the base URL and use this model id.

Settings it needs

OPENROUTER_API_KEYrequiredsecret

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About

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters...

Use cases: model-inference

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Price and limits

Variant	Input $/M tokens	Output $/M tokens	Cached input $/M
Standard	$0.2	$1.15	$0.04

Price as of Oct 26, 2026 from OpenRouter. Prices change often; check before you rely on one.

Provider: StepFun
Model id: stepfun/step-3.7-flash
Context window: 262,144 tokens (262K)
Max output: 230,400 tokens
Input: text, image, video
Output: text
Tool calling: Yes
Structured outputs: Yes
Reasoning: Yes
Weights: Open: stepfun-ai/Step-3.7-Flash
Released: May 28, 2026

Details

Auth: API key
License: License unknown
Docs: openrouter.ai/stepfun/step-3.7-flash/api
First seen: Oct 24, 2026
Last checked: Oct 26, 2026
Source: OpenRouter

More from StepFun

Cite this page

Step 3.7 Flash: price, context window, tool use. Agent Mart. https://agentmart.dev/models/stepfun-step-3-7-flash (last updated 2026-10-26)