StepFun

StepFun Chat Completions API

OpenAI-compatible chat completions for the Step model family (e.g. step-3.7-flash, step-3.5-flash, stepaudio-2.5-chat), with multimodal image/video/audio message parts, tool calling, JSON mode, streaming via SSE, reasoning output, and prompt caching with discounted cache-hit pricing.

GitHub

Documentation

📖
Documentation
https://platform.stepfun.com/docs/zh/api-reference/chat/chat-completion-create

Other Resources

🔗
APIsJSON
https://raw.githubusercontent.com/api-evangelist/stepfun/refs/heads/main/apis.yml

API entry from apis.yml

apis.yml Raw ↑ 
aid: stepfun:chat-completions-api
name: StepFun Chat Completions API
description: OpenAI-compatible chat completions for the Step model family (e.g. step-3.7-flash, step-3.5-flash,
  stepaudio-2.5-chat), with multimodal image/video/audio message parts, tool calling, JSON mode, streaming
  via SSE, reasoning output, and prompt caching with discounted cache-hit pricing.
humanURL: https://platform.stepfun.com/docs/zh/api-reference/chat/chat-completion-create
baseURL: https://api.stepfun.com
tags:
- AI
- LLM
- Chat Completion
- Multimodal
- Tool Calling
properties:
- type: Documentation
  url: https://platform.stepfun.com/docs/zh/api-reference/chat/chat-completion-create