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Provider details

StepFun (China)

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Latest news about StepFun (China)

StepFun (China)

CoveragePreview

Shanghai-based AI startup StepFun launched Step 5 Preview on September 20, 2026, releasing the API publicly at $1 per million input tokens and $2.70 per million output tokens. According to the report, the model is a 600-billion-parameter sparse mixture-of-experts (MoE) design that activates roughly 27 billion parameter On the Artificial Analysis Intelligence Index, the report places Step 5 Preview in the global top 25 of roughly 200 commercially available AI models, in the same performance tier as current flagships from OpenAI and Anthropic. The pricing is compared directly to GPT-4o at $5 per million input tokens and Claude 3.7 Sonn

About StepFun (China)

What they do

StepFun develops and serves generative AI models for text, multimodal understanding, and image generation through its API platform.

How they were founded

StepFun was founded on April 6, 2023 by Jiang Daxin, Zhu Yibo, and Jiao Binxing to build multimodal and generative AI models.

Sources

platform.stepfun.com pitchbook.com en.wikipedia.org

Quick Info

Organization: StepFun
Headquarters: Shanghai, China
SDK package: @ai-sdk/openai-compatible
Synced at: Jul 13, 2026

Models served

9 models available through StepFun (China)

These model results are sorted newest first so you can quickly see the latest options from this provider.

StepFun (China)

Step 5 Preview

step-5-previewStepFun (China)Released Sep 16, 20261,000,000 token context windowIn $0.959 · Out $2.741

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Output

StepFun (China)

Step 3.7 Flash

step-3.7-flashStepFun (China)Released May 29, 2026256,000 token context windowIn $0.185 · Out $1.11

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Output

StepFun (China)step

StepAudio 2.5 ASR

stepaudio-2.5-asrStepFun (China)Released Apr 24, 20260 token context window

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Output

StepFun (China)step

StepAudio 2.5 TTS

stepaudio-2.5-ttsStepFun (China)Released Apr 16, 20260 token context window

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Output

StepFun (China)

Step 3.5 Flash 2603

step-3.5-flash-2603StepFun (China)Released Apr 2, 2026256,000 token context windowIn $0.10 · Out $0.30

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Output

StepFun (China)step

Step TTS 2

step-tts-2StepFun (China)Released Mar 1, 20260 token context window

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StepFun (China)

Step 3.5 Flash

step-3.5-flashStepFun (China)Released Jan 29, 2026256,000 token context windowIn $0.10 · Out $0.30

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StepFun (China)

Step 2 (16K)

step-2-16kStepFun (China)Released Jan 1, 202516,384 token context windowIn $5.21 · Out $16.44

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StepFun (China)

Step 1 (32K)

step-1-32kStepFun (China)Released Jan 1, 202532,768 token context windowIn $2.05 · Out $9.59

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Output