Model family timeline
Last updated Mar 14, 2026
Step model releases
A source-backed timeline for the Step model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.
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