Step 3.7 Flash

StepFun · Released May 2026

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...

Facts and pricing

Provider

StepFun

Context window

256K tokens

Input price

2.2 credits / 1M tokens ($0.20 raw)

Output price

12.7 credits / 1M tokens ($1.15 raw)

Vision (image input)

Yes

Tool calling

Yes

Extended reasoning

No

Credits are what Zeplik bills: 1 credit = $0.10, computed from the raw provider rate with a 1.10x margin. Raw prices shown per 1M tokens.

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What Step 3.7 Flash is best for

• High-volume everyday tasks where speed and cost matter: summaries, drafts, quick questions
• Long documents: the 256K-token window holds lengthy reports, contracts or papers whole
• Working with images: screenshots, charts, photos and scanned documents alongside text
• Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows

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Frequently asked questions

What is Step 3.7 Flash?

Step 3.7 Flash is an AI model by StepFun. 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...

How much does Step 3.7 Flash cost on Zeplik?

Input tokens cost 2.2 credits per million and output tokens 12.7 credits per million (1 credit = $0.10; the raw provider rates are $0.20 and $1.15 per million). New accounts start with free credits.

How long can a conversation with Step 3.7 Flash be?

Step 3.7 Flash has a 256K-token context window (256,000 tokens), which covers the conversation plus any documents you attach.

Does Step 3.7 Flash support images and tools?

Step 3.7 Flash accepts image input and supports tool calling.

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