这个资源提供什么What this offer provides
StepFun 官方定价与限速页当前将 stepaudio-3-realtime-preview、stepaudio-3-chat-preview（按 Token 计费表）和 stepaudio-3-gen-preview、stepaudio-3-music-preview（音频/音乐生成表）标注为“限时免费”。step-audio-r1.1 已不在价目表（现为按量计费的 step-audio-r1.5），step-2x-large 官方公告 2026-10-10 下线。这个条目只记录限免模型，不把 Step Plan 订阅或其他付费模型算作免费。StepFun's official pricing page currently marks stepaudio-3-realtime-preview, stepaudio-3-chat-preview, stepaudio-3-gen-preview and stepaudio-3-music-preview as limited-time free. step-audio-r1.1 is no longer listed (step-audio-r1.5 is pay-as-you-go) and step-2x-large is announced offline on 2026-10-10. This entry covers only the limited-free models, not Step Plan subscriptions or other paid models.
关键信息Key details
快速上手Quick start
通过 StepFun 开放平台 API 调用官方定价页标注为限免中的模型；其他模型按量计费Call StepFun models marked limited free on the official pricing page; other models are pay-as-you-go
注册与接入步骤Registration and access steps
准备条件Prerequisites
- StepFun account
- StepFun API key
- Create a StepFun Open Platform account and API keyCreate a StepFun Open Platform account and API key
- Use the OpenAI-compatible chat endpoint with a currently limited-free model IDUse the OpenAI-compatible chat endpoint with a currently limited-free model ID
- Recheck the official pricing page before use because the limited-free label may changeRecheck the official pricing page before use because the limited-free label may change
- The curl example uses stepaudio-3-chat-preview and has not been tested by FreeLLM (未实测); realtime / gen / music preview models may need their own endpoints — follow the official model docsThe curl example uses stepaudio-3-chat-preview and has not been tested by FreeLLM ( ); realtime / gen / music preview models may need their own endpoints — follow the official model docs
发送第一条请求Send first request
使用下方命令开始调用。Use the command below to make your first request.
export STEP_API_KEY="你的 Key"
curl https://api.stepfun.com/v1/chat/completions --header "Authorization: Bearer $STEP_API_KEY" --header 'Content-Type: application/json' --data '{"model":"stepaudio-3-chat-preview","messages":[{"role":"user","content":"Hello"}]}'免费模型逐个看Free models by entry
| 模型Model | 免费额度Free quota | 备注Notes |
|---|---|---|
stepaudio-3-realtime-previewstepaudio-3-realtime-preview | 限时免费（官方定价页标注）（ ） | 以官方定价页为准；FreeLLM 未实测；FreeLLM |
stepaudio-3-chat-previewstepaudio-3-chat-preview | 限时免费（官方定价页标注）（ ） | 以官方定价页为准；FreeLLM 未实测；FreeLLM |
stepaudio-3-gen-previewstepaudio-3-gen-preview | 限时免费（官方定价页标注）（ ） | 以官方定价页为准；FreeLLM 未实测；FreeLLM |
stepaudio-3-music-previewstepaudio-3-music-preview | 限时免费（官方定价页标注）（ ） | 以官方定价页为准；FreeLLM 未实测；FreeLLM |
额度以官方页面和控制台实时显示为准；公测或限免额度可能随时调整。Quota follows the official page and console; preview or limited free access can change.
如何使用How to use
通过 StepFun 开放平台 API 调用官方定价页标注为限免中的模型；其他模型按量计费StepFun API ；
前置条件Prerequisites
- StepFun accountStepFun account
- StepFun API keyStepFun API key
步骤Steps
- Create a StepFun Open Platform account and API keyCreate a StepFun Open Platform account and API key
- Use the OpenAI-compatible chat endpoint with a currently limited-free model IDUse the OpenAI-compatible chat endpoint with a currently limited-free model ID
- Recheck the official pricing page before use because the limited-free label may changeRecheck the official pricing page before use because the limited-free label may change
- The curl example uses stepaudio-3-chat-preview and has not been tested by FreeLLM (未实测); realtime / gen / music preview models may need their own endpoints — follow the official model docsThe curl example uses stepaudio-3-chat-preview and has not been tested by FreeLLM ( ); realtime / gen / music preview models may need their own endpoints — follow the official model docs
官方来源Official sources
StepFun 官方定价与限速页面（2026-10-10 核对）将 stepaudio-3-realtime-preview、stepaudio-3-chat-preview、stepaudio-3-gen-preview、stepaudio-3-music-preview 标为“限时免费”；step-audio-r1.1 已不在价目表，step-2x-large 官方公告 2026-10-10 下线。官方快速开始与对话补全文档给出 https://api.stepfun.com/v1/chat/completions 的 OpenAI 兼容调用方式。StepFun （2026-10-10 ） stepaudio-3-realtime-preview、stepaudio-3-chat-preview、stepaudio-3-gen-preview、stepaudio-3-music-preview “ ”；step-audio-r1.1 ，step-2x-large 2026-10-10 。 https://api.stepfun.com/v1/chat/completions OpenAI 。