Step 3.7 Flash

Name: StepFun: Step 3.7 Flash
Brand: stepfun
SKU: stepfun/step-3.7-flash
Price: 0.22 USD
Availability: InStock

stepfun/step-3.7-flash

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

$0.22 in · $1.265 out per 1M tokens262k contextMay 28, 2026

about 0.07¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with Step 3.7 Flash

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Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $0.22provider $0.20
Output, per 1M tokens: $1.265provider $1.15
Cached input, per 1M: $0.044provider $0.04
Margin: +10%

Context and formats

Context window: 262,144 tokens
Longest answer: 230,400 tokens
Reads: text, images, and video
Makes: text
First listed: 2026-05-28

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=stepfun/step-3.7-flash.

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...

In StepFun's words.

Try it here

Cmd+Enter sends

The answer appears here.

Measured here

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Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "stepfun/step-3.7-flash", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

<a href="https://useantimatter.com/planet/stepfun/step-3.7-flash"><img src="https://useantimatter.com/api/badge/price?id=stepfun%2Fstep-3.7-flash" alt="Step 3.7 Flash price on Antimatter" height="28"></a>

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