StepFun models, priced in toman
3 StepFun models are live on uttapen. Prices are in toman per 1 million tokens, and you are charged for the tokens you actually use.
StepFun on uttapen
StepFun currently has 3 models in the uttapen catalogue. All of them bill against a toman wallet, for the tokens a request actually used.
The spread inside StepFun alone is wide: Step 3.5 Flash runs about 180 toman for a 1,000-word request, while Step 5 Preview costs 1,665 toman for the same one. Picking the right model inside a brand matters as much as picking the brand.
Measured against the whole catalogue, the median StepFun output price undercuts about 61% of the other paid models.
On capabilities: 2 take image input, 3 support tool calling, 3 do multi-step reasoning. The longest context belongs to Step 5 Preview, at 1,048,576 tokens.
Every StepFun model answers on the same sk-up- key and the same base_url: switching between them means changing the `model` string and nothing else.
Which StepFun model should I start with?
Every StepFun model, priced in toman
| Model | Capabilities | Context | Input / 1M | Output / 1M |
|---|---|---|---|---|
Step 3.5 Flashstepfun/step-3.5-flash | Tool callingReasoning | 262,144 | 34,622 | 103,866 |
Step 3.7 Flashstepfun/step-3.7-flash | Image inputTool callingReasoningJSON output | 262,144 | 69,244 | 398,152 |
Step 5 Previewstepfun/step-5-preview | Image inputTool callingReasoningJSON output | 1,048,576 | 346,219 | 934,792 |
Common questions about the StepFun API
- How do I reach the StepFun API from Iran?
- Sign up with your mobile number, top the wallet up in toman and create an sk-up- key. Then, in the official OpenAI SDK, point base_url at https:/
/ api.uttapen.ir/ v1 and set model to the StepFun model id. No international card, no VPN. - What do StepFun models cost in toman?
- It depends on the model: the cheapest, Step 3.5 Flash, is about 180 toman for a 1,000-word request, and the dearest, Step 5 Preview, about 1,665 toman. Each model page carries its own exact price, and you are billed for what the request actually used.
- How many StepFun models are on uttapen?
- 3. 3 support tool calling and 2 accept image input. The catalogue re-syncs hourly, so a newly released model shows up here on its own.