StepFun API pricing
Every StepFun model we track, per 1M tokens, from the official pricing page.
StepFun API prices run from $0.10 in and $0.30 out per 1M tokens (Step 3.5 Flash) up to $1 in and $2.70 out (Step 5 Preview). Its cheapest model is number 2 of 77 on our full list. Checked Oct 29, 2026 against the official pricing page.
StepFun's Step models: 3 are priced here, from $0.10 in and $0.30 out per 1M tokens (Step 3.5 Flash) to $1 in and $2.70 out (Step 5 Preview). Each model name below opens its own page with workload costs, LMArena ranks and cheaper alternatives.
| Model | Input | Cached | Output | Context |
|---|---|---|---|---|
| Step 3.5 Flashstep-3.5-flash | $0.10 | $0.02 | $0.30 | n/a |
| Step 3.7 Flashstep-3.7-flash | $0.20 | $0.04 | $1.15 | n/a |
| Step 5 Previewstep-5-previewPreview. The input price includes writing new content to the cache. | $1 | $0.10 | $2.70 | n/a |
Which StepFun model should you pick?
- Cheapest: Step 3.5 Flash at $0.10 in and $0.30 out, number 2 of 77 on our full price list.
- Best on LMArena: Step 5 Preview, #28 of 50 priced models on Code Arena, at $1 in and $2.70 out.
- Flagship: Step 5 Preview at $1 in and $2.70 out.
How it compares
Cheapest models from other providers, blended per 1M tokens: Qwen3.7 Flash (Qwen) $0.06 · Qwen3.5 Flash (Qwen) $0.17 · Seed 2.0 Mini (ByteDance Seed) $0.17. See the full API price table, the best model for each task or the plan vs API calculator.
Looking for the lowest price per token? See the cheapest LLM API ranking.
FAQ
How much does the StepFun API cost?
From $0.10 input and $0.30 output per 1M tokens for Step 3.5 Flash, up to $1 and $2.70 for Step 5 Preview.
What is the cheapest StepFun model?
Step 3.5 Flash, with a blended price of $0.15 per 1M tokens (3 parts input to 1 part output).
Is a subscription cheaper than the StepFun API?
It depends on how much you use it. Try our plan vs API calculator with your own usage.
Which StepFun model is the best?
By LMArena rank among the models we price, Step 5 Preview ranks highest at #28 on Code Arena.
Does the StepFun API have cheaper cached input?
Yes, for 3 of 3 models: cached input is listed at $0.02 to $0.10 per 1M tokens.
Other providers: OpenAI · Anthropic · Google · Meta · DeepSeek · Qwen · Mistral · xAI · Kimi · GLM (Z.ai) · MiniMax · ByteDance Seed · Tencent Hunyuan · Baidu ERNIE · Xiaomi MiMo