StepFun: Step 2 (16K)
Step 2 (16K) is a language model from StepFun released on Jan 1, 2025. It reads text and writes text, with a 16K token context window and up to 8K tokens per reply.
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It costs $5.21 per million input tokens and $16.44 per million output tokens. Cached input bills at $1.04, 80% less than fresh input.
It supports tool calling and prompt caching.
2 providers serve it, including StepFun (Global).
- Modalities
- In / out price
- $5.21 / $16.44 per 1M
- Context
- 16K
- Max output
- 8K
- Released
- Jan 1, 2025
- Knowledge cutoff
- Jun 2024
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Step 2 (16K) pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $5.21 / 1M tokens | |
|---|---|---|
| Output | $16.44 / 1M tokens | |
| Cached input (read) | $1.04 / 1M tokens | 80% off input |
Step 2 (16K) providers
2 providers serve it, including StepFun (Global). Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| StepFun (China) First party | $5.21 | $16.44 | $1.04 | 16K | 8K |
| StepFun (Global) | $5.21 | $16.44 | $1.04 | 16K | 8K |
What Step 2 (16K) costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Step 2 (16K) through an OpenAI compatible API.
- Tools
tools - Temperature
temperature
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Step 2 (16K) questions
How much does the Step 2 (16K) API cost?
$5.21 per million input tokens and $16.44 per million output tokens, with cached input at $1.04. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Step 2 (16K)?
16,384 tokens of input, and it can write up to 8,192 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Step 2 (16K)?
2 providers serve it, including StepFun (Global). Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Step 2 (16K) support tool calling?
Yes. It accepts tool definitions, which is what an agent needs to call your APIs.
Is Step 2 (16K) open source?
No. StepFun serves it through an API only, so you cannot download the weights or host it yourself.
When was Step 2 (16K) released?
Jan 1, 2025, with training data up to Jun 2024.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.