ST

StepFun

Model organization

StepFun develops the Step family of general-purpose language models.

Families: 1
Models: 4
Providers: 10
Latest release: 2026-09-20

Model families


Step	4	2026-09-20	Active

Models

4 of 4 model versions

	Family			Max output	Input type	Output type	Reasoning	Tool call	Structured	Temperature	Weights
Step 5 Preview	Step	-	1M	64K			-No	-No	-No	-No	—				-	2026-09-20
Step 3.7 Flash	Step	9	256K	256K			Yes	Yes	-No	Yes	Open				-	2026-05-29
Step 3.5 Flash 2603	Step	3	256K	256K			Yes	Yes	-No	Yes	Open				-	2026-04-02
Step 3.5 Flash	Step	8	256K	256K			Yes	Yes	-No	Yes	Open				-	2026-01-29

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