StepFun / stepfun/step-3.5-flash
Step 3.5 Flash - access through LLMTR
Step 3.5 Flash is a StepFun model for text chat, coding help, information synthesis, and long-context assistant flows. It supports Chat Completions, tool calling, and JSON mode; controllable reasoning_effort is not exposed for this variant.
Technical specifications
| Canonical ID | stepfun/step-3.5-flash |
|---|---|
| Provider | StepFun |
| Context window | 256,000 tokens |
| Operations | CHAT_COMPLETIONS |
| Modalities | text |
Pricing
A 6% platform margin applies to credit top-ups; model usage prices are not separately marked up.
| Operation | Metric | Unit | Price |
|---|---|---|---|
| CHAT_COMPLETIONS | CACHE_READ | PER_1M_TOKENS | Not available |
| CHAT_COMPLETIONS | INPUT_TEXT | PER_1M_TOKENS | Not available |
| CHAT_COMPLETIONS | OUTPUT_TEXT | PER_1M_TOKENS | Not available |
Example usage
With existing OpenAI SDK flows, change only the base URL and model identifier.
curl https://llmtr.com/v1/chat/completions \
-H "Authorization: Bearer llmtr-your_key" \
-H "Content-Type: application/json" \
-d '{"model":"stepfun/step-3.5-flash","messages":[{"role":"user","content":"Hello"}]}'Related models
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