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StepFun Open Platform

Model API

by StepFun

API access to StepFun's text, vision, speech and image models, with credit packages and enterprise plans.

Find alternatives to StepFun Open Platform

Per-token rates in CNY per 1M tokens (step-3.5-flash ¥0.7 in / ¥0.14 cached / ¥2.1 out; step-3.7-flash ¥1.35 / ¥0.27 / ¥8.1), TTS per 10,000 characters, ASR per hour, images per image (step-2x-large ¥0.1, step-image-edit-2 ¥0.02), voice cloning ¥9.9 a voice, plus value-added services (web search ¥0.04 a query, text-to-image search ¥0.12, file storage ¥0.5/GB/day). Enterprise packages are opened by contract.

What it does

• Model inference
• Text generation
• Image generation
• Text to speech

How it compares

• Gemini API

  We introduce a state-of-the-art image editing model, Step1X-Edit, which aims to provide comparable performance against the closed-source models like GPT-4o and Gemini2 Flash.

  Official documentation · 19 Sep 2026
• OpenAI API

  We introduce a state-of-the-art image editing model, Step1X-Edit, which aims to provide comparable performance against the closed-source models like GPT-4o and Gemini2 Flash.

  Official documentation · 19 Sep 2026

Sources

Pricing

Pricing page · 6 Sep 2026

The platform's pricing document publishes per-1,000,000-token input and output prices in CNY for each Step model, alongside prepaid credit packages from CNY 100 to CNY 10,000.

Sold within

Pricing page · 30 Sep 2026

StepFun's own rate card "定价与限速" [Pricing and rate limits] lists per-model prices (e.g. step-3.7-flash "1.35 元" [CNY 1.35] per "1M tokens" input) and states "开放平台标准 API 的按量付费调用按账户累计充值金额分档限速" [pay-as-you-go calls to the Open Platform's standard API are rate-limited in tiers by the account's cumulative top-up]. Personal accounts top up after real-name verification: "个人账户需先完成实名认证，档位按累计充值金额划分" [personal accounts must first complete real-name verification; tiers are divided by cumulative top-up].

Deployment

Self-reported · 8 Sep 2026

Inferred 2026-09-08, not read off a page: every already-decided product of type 'model-api' in this catalogue includes "saas" in its deployment list, zero exceptions, per item 198's measured cross-tab. May be incomplete if this product also offers a self-hosted or private-cloud option; not wrong either way.

Also from StepFun

• 阶跃AI (StepFun AI) Application

  StepFun's consumer AI assistant, available on the web and as Windows and macOS desktop clients, offering web search, knowledge-base Q&A, image creation, tool use and speech recognition.

• StepClaw AI agent

  A one-click cloud-deployed AI agent offered inside the 阶跃AI assistant that interprets instructions and carries out tasks autonomously.

• 阶跃星辰 AI Studio (StepFun AI Studio) Developer tool

  A browser-based workspace for building, testing and deploying AI applications on StepFun's models, with a playground, a showcase library of example apps and a personal asset library.

• Step Plan API service

  A subscription service from the StepFun Open Platform that supplies a monthly Credit pool for calling StepFun's flagship models from third-party coding tools and agent clients such as Claude Code, Cursor, OpenClaw, Cline and Zed.

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