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StepFun (阶跃星辰)

by StepFun@stepfun_aiShanghai, ChinaNo ratings yet

StepFun model API for language, speech, and image models

Visit stepfun.com
Tool type
Model API platform
Made for
Developers and AI application teams
Runs on
Hosted API and browser Studio
Models run on StepFun's hosted API endpoints. The console handles API key setup, and Studio runs in the web browser.
Last checked
29 Oct 2026
2 product sources

What it does

StepFun's platform provides API access to its language, speech, and image models through a single API key. Developers send text prompts in an OpenAI-compatible chat format and receive model responses. Speech models cover recognition, synthesis, voice generation, realtime interaction, and music generation, and the flagship language models include Step 5 Preview, Step 3.7 Flash, and Step 3.5 Flash.

Developers create an API key, point an OpenAI-style client at the StepFun base URL, and call a chosen model ID. Studio lets users try models in the browser before wiring up the API. Step Plan is a monthly subscription for building with StepFun models, with built-in multi-model routing for common agent frameworks, and it is separate from pay-as-you-go API usage.

The platform suits developers and early-stage teams building AI applications, agents, or voice features who want one key for several model types. Access requires registering for an API key, and the official documentation and pricing pages should be checked for current rates and plan terms before committing.

What it can do

  • Chat-style text generation through an OpenAI-compatible API
  • Speech recognition with StepAudio 3 ASR
  • Text-to-speech synthesis with StepAudio 3 TTS
  • Realtime voice interaction with StepAudio 3 Realtime
  • Voice and music generation with StepAudio 3 Gen and StepAudio 3 Music
  • Browser-based model testing in Studio

Works with

  • OpenAI Python client library (base URL can be pointed at StepFun)

Before you choose

  • Pay-as-you-go API usage is separate from the Step Plan monthly subscription; a Step Plan does not automatically cover every API call.
  • Rate-limit increases are requested through technical support.

Listed under

Get started

Register, obtain an API key, then call a model through the API.

  1. Register on the platform and obtain an API key from the console.
  2. Install the OpenAI Python client library and set the base URL to the StepFun endpoint.
  3. Replace the placeholder model ID with a supported model name and send a chat request.
Get an API key

Plans and prices

Confirm the applicable plan, usage charges and commercial terms with the provider.

We couldn’t find published prices for StepFun (阶跃星辰). See their pricing page ↗

Sources for this overview

Product pages, documentation, and pricing checked 29 Oct 2026. Each source supports part of the overview; availability and prices can change.

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Last checked 29 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.