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Step 3.7 Flash

Step
by StepFun AI

A sparse MoE multimodal reasoning model good for enterprise, agentic and coding tasks.

Try in Chat
Free EndpointDownloadableMay 28, 2026open license4M API calls / 30d

Specifications

Context Length
131K
131,072 tokens
Input Price
Free
per 1M tokens
Output Price
Free
per 1M tokens
Modalities
2
text→text, image+text→text

Capabilities

text generationchatcodereasoningagentic

Tags

codingagenticMoE

API Usage

1Router is fully OpenAI-compatible. Just set the base URL and use this model ID:

stepfun-ai/step-3.7-flash
cURL
curl https://api.1router.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepfun-ai/step-3.7-flash",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'