StepFun API Pricing & Model Comparison
We track 2 StepFun models, with input pricing from $0.10 to $0.20 per million tokens. The line-up's blended rate runs 89% below the catalog average. Below: price, context, speed and value compared across the range.
For cost, StepFun's cheapest option is Step 3.5 Flash ($0.10 input / $0.30 output); the quality ceiling is Step 3.7 Flash at a quality score of 85. On a 50,000-turn-per-month support workload that is $18 versus $49 — the spread inside a single provider is often wider than the spread between providers.
On value (quality score ÷ output price) the pick of the StepFun range is Step 3.5 Flash. The largest context window is 262K, shared by 2 models in the range, and the fastest output is Step 3.5 Flash at 190 tok/s. Modalities across the line-up: Text, Vision.
Models and pricing
Sorted by blended rate, cheapest first (3:1 input-to-output mix). Follow a model name for full specs and monthly cost estimates.
| Model | Input /1M | Output /1M | Blended /1M | Quality | Context | Speed | Value | Use cases |
|---|---|---|---|---|---|---|---|---|
| Step 3.5 Flash | $0.10 | $0.30 | $0.15 | 79 | 262K | 190 tok/s | 263.3 | ChatbotAffordableFast |
| Step 3.7 Flash | $0.20 | $1.15 | $0.44 | 85 | 262K | 140 tok/s | 73.9 | ChatbotCodingMultimodal |
Frequently asked questions
Which StepFun model is cheapest?
Step 3.5 Flash, at $0.10 input and $0.30 output per million tokens, with a quality score of 79.
What is StepFun's flagship model?
By quality score it is Step 3.7 Flash (85), priced at $0.20 input / $1.15 output with a 262K context window.
Does StepFun pricing change?
Yes. llmprice.app runs a daily collection job and refreshes these figures, but there can be a lag after a provider re-prices — confirm against StepFun's official pricing page before committing.
Prices and specs are collected daily by llmprice.app. Confirm against the official pricing page before production use.