by StepFunReleased Jan 29, 2026
stepfun/step-3.5-flashStep 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
| Billed for | You pay |
|---|---|
| Input tokens | $0.12 / 1M |
| Output tokens | $0.36 / 1M |
$0.12 per million input tokens and $0.36 per million output tokens, paid from the token's AI credit. A call of 2,000 tokens in and 500 out costs about $0.0004.
Make a router key for one of your tokens on the dashboard, point any OpenAI or Anthropic SDK at https://relayfor.si/api/v1 and send the model id stepfun/step-3.5-flash. The token's AI credit pays for each call.
Up to 262,144 tokens of context, and up to 65,536 tokens in one answer.
No. The RFS Router passes each call through and keeps only its token counts and cost, for the token's usage page.
import OpenAI from "openai";const ai = new OpenAI({ baseURL: "https://relayfor.si/api/v1", apiKey: process.env.RELAYFOR_ROUTER_KEY,});const reply = await ai.chat.completions.create({ model: "stepfun/step-3.5-flash", messages: [{ role: "user", content: "Welcome the 1,000th holder in one line." }],});| Provider | Answered, 24 h |
|---|---|
| SiliconFlowfp8 | 100% |