StepFun

Connection

Field	Value
Anvia SDK	@anvia/openai
Compatibility	OpenAI-compatible endpoint
API URL	https://api.stepfun.com/v1
Environment	STEPFUN_API_KEY
Provider docs	https://platform.stepfun.com/docs/zh/overview/concept
Models	5

Anvia Usage

This provider is listed as OpenAI-compatible. Start with @anvia/openai and the chat-completions adapter, then smoke test the exact workflow.

import { OpenAIClient } from "@anvia/openai";

const client = new OpenAIClient({
  apiKey: process.env.STEPFUN_API_KEY,
  baseUrl: "https://api.stepfun.com/v1",
  completionApi: "chat",
});

const model = client.completionModel("step-1-32k");

Capabilities

Capability	Value
Input modalities	image, text
Output modalities	text
Attachments	1 / 5 models
Tools	5 / 5 models
Structured output	0 / 5 models
Reasoning	5 / 5 models
Temperature	5 / 5 models
Open weights	3 / 5 models

Models

Model	Family	Input	Output	Capabilities	Limits	Cost	Updated
step-1-32k Step 1 (32K)	-	text	text	tools, reasoning, temperature	context: 32768 / input: 32768 / output: 32768	input: 2.05 / output: 9.59 / cache_read: 0.41	2026-02-13
step-2-16k Step 2 (16K)	-	text	text	tools, reasoning, temperature	context: 16384 / input: 16384 / output: 8192	input: 5.21 / output: 16.44 / cache_read: 1.04	2026-02-13
step-3.5-flash Step 3.5 Flash	-	text	text	tools, reasoning, temperature, open weights	context: 256000 / input: 256000 / output: 256000	input: 0.1 / output: 0.3 / cache_read: 0.02	2026-06-15
step-3.5-flash-2603 Step 3.5 Flash 2603	-	text	text	tools, reasoning, temperature, open weights	context: 256000 / input: 256000 / output: 256000	input: 0.1 / output: 0.3 / cache_read: 0.02	2026-04-02
step-3.7-flash Step 3.7 Flash	-	image, text	text	tools, reasoning, temperature, open weights	context: 256000 / input: 256000 / output: 256000	input: 0.19 / output: 1.13 / cache_read: 0.04	2026-05-29

Read Gateway caveats before enabling this provider in production.