StepFun

Model Creator

StepFun (阶跃星辰) is a Chinese AI lab building the Step series of multimodal foundation models (text, vision and audio), offered via its own API with per-token pricing and prompt caching.

Models

Prompt Caching

✓

Batch Discount

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Tool Calling

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Model9

Model	Input Price	Output Price	Cached Input	Context	Modality
step-1o-audioStep	$3.69	$8.86	$0.7385	—	textaudio
step-1o-turbo-visionStep	$0.3693	$1.18	$0.0739	—	textimage
step-3.5-flashStep	$0.1034	$0.3102	$0.0207	—	text
step-3.5-flash-2603Step	$0.1034	$0.3102	$0.0207	—	text
step-3.7-flashStep	$0.1994	$1.2	$0.0399	—	text
step-audio-2Step	$1.48	$10.34	$0.2954	—	textaudio
stepaudio-2.5-chatStep	$1.48	$3.69	$0.2954	—	textaudio
stepaudio-2.5-realtimeStep	$1.48	$10.34	$0.2954	—	textaudio
step-audio-r1.5Step	$1.48	$15.51	$0.2954	—	textaudio