Step 3.7 Flash Free

Step 3.7 Flash Free by StepFun, available on Aether API through one OpenAI-compatible API key. Priced at Free. 262K context window.

Pricing

Provider	StepFun
Model ID	step-3.7-flash-free
Endpoint	https://aetherapi.dev/v1/chat/completions
Context window	262K
Input	Free/1M tokens
Output	Free/1M tokens
Official provider price	$0.2/1M input · $1.15/1M output

Supported endpoints

• POST https://aetherapi.dev/v1/chat/completions
• POST https://aetherapi.dev/v1/responses
• POST https://aetherapi.dev/v1/messages

How to call it

Send a request to https://aetherapi.dev/v1/chat/completions with your Aether API key:

curl https://aetherapi.dev/v1/chat/completions \
  -H "Authorization: Bearer sk-aetherapi-..." \
  -H "Content-Type: application/json" \
  -d '{"model":"step-3.7-flash-free","messages":[{"role":"user","content":"Hello"}]}'

Related

Compare this model against every other model on the models page, or see Aether API pricing and the chat completions reference.