AI models

NanoGPTstep

Step 3.5 Flash

stepfun-ai/step-3.5-flashNanoGPTReleased Feb 2, 2026256,000 token context windowIn $0.20 · Out $0.50

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Vercel AI Gatewaystep

Step 3.7 Flash

stepfun/step-3.7-flashVercel AI GatewayReleased May 28, 2026256,000 token context windowIn $0.20 · Out $1.15

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StepFun (China)step

Step TTS 2

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

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StepFun (Global)step

Step TTS 2

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

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StepFun (China)step

StepAudio 2.5 ASR

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

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StepFun (Global)step

StepAudio 2.5 ASR

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

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StepFun (China)step

StepAudio 2.5 TTS

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

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StepFun (Global)step

StepAudio 2.5 TTS

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

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Vercel AI Gatewaystep

StepFun 3.5 Flash

stepfun/step-3.5-flashVercel AI GatewayReleased Jan 29, 2026262,114 token context windowIn $0.09 · Out $0.30

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SiliconFlowstep

stepfun-ai/Step-3.5-Flash

stepfun-ai/Step-3.5-FlashSiliconFlowReleased Feb 11, 2026262,000 token context windowIn $0.10 · Out $0.30

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SiliconFlow (China)step

stepfun-ai/Step-3.5-Flash

stepfun-ai/Step-3.5-FlashSiliconFlow (China)Released Feb 11, 2026262,000 token context windowIn $0.10 · Out $0.30

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