Step 3.7 Flash API Pricing

Step 3.7 Flash pricing by provider

3 listings across 3 providers. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

What Step 3.7 Flash costs in practice

1,000 requests with 2,000 input and 500 output tokens each

100 long-document requests with 100,000 input and 2,000 output tokens each

Step 3.7 Flash features

• Function calling
• Structured output
• Image input
• Reasoning
• Prompt caching

Use Step 3.7 Flash with LiteLLM

Call Step 3.7 Flash through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/chat/completions. LiteLLM tracks the cost of every request at these prices.

from litellm import completion

response = completion(
    model="deepinfra/stepfun-ai/Step-3.7-Flash",
    messages=[{"role": "user", "content": "Hello!"}],
)

model_list:
  - model_name: step-3.7-flash
    litellm_params:
      model: deepinfra/stepfun-ai/Step-3.7-Flash
      api_key: os.environ/DEEPINFRA_API_KEY

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "step-3.7-flash",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Step 3.7 Flash FAQ