OptimTokenOptimToken › Models by maker › StepFun
StepFun API pricing
As of 2026-10-22, the OptimToken catalogue holds 3 StepFun models. By price tier, 1 is Mid-range and 2 Budget. The cheapest is Step 3.5 Flash at $0.10 per 1M input tokens and $0.30 per 1M output tokens. The most expensive is Step 5 Preview at $1.00 input and $2.70 output, 9.1x the cheapest on blended price (30% input, 70% output). These are the prices we quote: a model sold by several hosts has other rates, listed on its own page.
StepFun models and prices
| Model | Input | Output | Batch (in / out) | Cache read | Context | Licence |
|---|---|---|---|---|---|---|
| Step 3.5 Flash | $0.10 | $0.30 | not published | not published | 262K | Open source (Apache 2.0) |
| Step 3.7 Flash | $0.20 | $1.15 | not published | $0.04 | 262K | Open source (Apache 2.0) |
| Step 5 Preview | $1.00 | $2.70 | not published | $0.10 | 1M | Open weights (StepFun Model License) |
Published discounts: a prompt-cache read rate for 2 of the 3 and a batch rate for none. The most recent by release date is Step 5 Preview (2026-10). Arena ELO scores (as of 2026-10-08) exist for 2 of the 3; the highest is Step 5 Preview at 1447.
Licences
Of the 3, 2 are open source: their weights are published under the Apache 2.0 licence, OSI-approved with no field-of-use limit, so they can be self-hosted as well as bought by the token. One more is open weights, which is not the same as open source: the weights are published, but under the StepFun Model License licence, which restricts some uses. Read it before self-hosting commercially. Licences are as recorded in this catalogue: check the maker's own terms before relying on one.
Price changes since tracking began
Our daily price archive began on 2026-08-15 and holds a record for all 3 models. The price we quote has not changed for any of them since each was first recorded. One model joined after tracking began: Step 5 Preview, on 2026-10-18. Last checked against the 2026-10-22 snapshot.
Other makers
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- Anthropic (Claude) API pricing
- ByteDance (Seed) API pricing
- Cohere (Command) API pricing
- DeepSeek API pricing
- Google (Gemini) API pricing
- Inception (Mercury) API pricing
- inclusionAI (Ling) API pricing
- Meta API pricing
- MiniMax API pricing
- Mistral API pricing
- Moonshot (Kimi) API pricing
- Nvidia (Nemotron) API pricing
- OpenAI (GPT) API pricing
- Perplexity (Sonar) API pricing
- Sakana (Fugu) API pricing
- Tencent (Hy) API pricing
- Upstage (Solar) API pricing
- xAI (Grok) API pricing
- Xiaomi (MiMo) API pricing
- Zhipu (GLM) API pricing
Models by maker: every model in the catalogue, including makers with fewer than 3.
Your real cost also depends on caching and batching, negotiated discounts, marketplace agreements, and the contracts you already have. OptimNow audits exactly that.
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