Lab release history
Last updated Mar 14, 2026
StepFun model releases
Chinese AI startup building Step multimodal and agentic foundation models. This page collects the lab's model releases, lifecycle events, source links, and model metadata in one crawlable record.
4
Models
1
Labs
1
Open
4
Recent
4 models
Step-3.5-Flash
AvailableStepFunOpen source
StepFun's Apache-licensed sparse MoE model for fast agentic execution, coding, math, browsing, and tool-use workflows.
Type
MoE
Params
196B
Context
256K
Top eval
—
Released
Mar 14, 2026
3mo ago
MoE196B256K ctxMar 14, 2026
Step-2
AvailableStepFunProprietary
Second-generation StepFun foundation model line with larger-scale multimodal and reasoning ambitions.
Type
—
Params
Undisc.
Context
—
Top eval
—
Released
Dec 23, 2024
1.5y ago
—Undisc.— ctxDec 23, 2024
Step-1V
AvailableStepFunProprietary
StepFun's first major vision-language model, released after the Step-1 language model.
Type
—
Params
Undisc.
Context
—
Top eval
—
Released
Apr 12, 2024
2.2y ago
—Undisc.— ctxApr 12, 2024
Step-1
AvailableStepFunProprietary
StepFun's first public foundation model generation, introduced as a trillion-parameter Chinese model line.
Type
—
Params
Undisc.
Context
—
Top eval
—
Released
Mar 23, 2024
2.2y ago
—Undisc.— ctxMar 23, 2024