About
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.
Pricing
| Input | $0.28 | per 1M prompt tokens |
|---|---|---|
| Output | $1.61 | per 1M generated tokens, reasoning included |
| Cached input | $0.06 | per 1M tokens read back from the prompt cache |
What a request costs
| Typical request | Each | Per 1,000 |
|---|---|---|
| Short chat reply1,500 in · 400 out | $0.0011 | $1.06 |
| Question over a long document40,000 in · 800 out | $0.012 | $12.49 |
| Agent tool step20,000 in · 1,200 out | $0.0075 | $7.53 |
At the developer-API rate, before any provider promotion or prompt-cache saving. In the app, the model picker shows what a message costs on your plan before you send it.
Benchmarks
Head-to-head rankings
- #42ASCII artModel arenaElo 115445% wins
- #62WebsitesModel arenaElo 119844% wins
- #64CodeModel arenaElo 118442% wins
- #64SVGModel arenaElo 108237% wins
- #64UI componentsModel arenaElo 117942% wins
- #69Data vizModel arenaElo 117343% wins
- #69Game devModel arenaElo 116139% wins
- #773DModel arenaElo 112941% wins
Scores from Artificial Analysis; bars are scaled to the best model on our list. Rankings from Design Arena head-to-head votes. Published by OpenRouter alongside its catalogue.
Call it from code
OpenAI-compatible: point any OpenAI SDK at https://api.privateer.pro/v1 and set
model. Keys are created in the app under Settings.
cURL
curl https://api.privateer.pro/v1/chat/completions \
-H "Authorization: Bearer $PRIVATEER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "stepfun/step-3.7-flash",
"messages": [{ "role": "user", "content": "Hello" }]
}'Python
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.privateer.pro/v1",
api_key=os.environ["PRIVATEER_API_KEY"],
)
reply = client.chat.completions.create(
model="stepfun/step-3.7-flash",
messages=[{"role": "user", "content": "Hello"}],
)
print(reply.choices[0].message.content)JavaScript
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.privateer.pro/v1",
apiKey: process.env.PRIVATEER_API_KEY,
});
const reply = await client.chat.completions.create({
model: "stepfun/step-3.7-flash",
messages: [{ role: "user", content: "Hello" }],
});
console.log(reply.choices[0].message.content);Parameters this model accepts
frequency_penaltyinclude_reasoninglogprobsmax_tokenspresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p