StepFun Step-2
StepFun Step-2 is a released long context model with 128k context; evaluate it while provider pricing coverage matures.
Use it for
- Teams evaluating long context
- Workloads that can use a 128k context window
Do not use it for
- Cost-sensitive launches that need sourced token pricing
- Vision or document-understanding workloads
- Strict JSON or tool-calling flows
- Family
- Step
- Released
- 2025-10-15
- Context
- 128k
- Parameters
- 1T (MoE)*
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
No tracked provider token pricing is available yet.
About
StepFun Step-2 is StepFun's Step model. It offers a 128K-token context window.
StepFun Step-2 is a proprietary model in the Step family. The structured metadata tracks a 128k-token context window. No headline benchmark score is tracked for StepFun Step-2 yet.
Top use-case fit
Long context
Included by capability and metadata signals in the decision map.
Provider price ladder
No tracked provider token pricing is available for this model yet.
Capabilities
No model capability flags are currently sourced.
Benchmark peer barsfor Long context
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
Compare StepFun Step-2 with other models
Comparison and alternatives
Browse all comparisons →Frequently asked questions
What is the context window of StepFun Step-2?
StepFun Step-2 has a context window of 128k tokens.
When was StepFun Step-2 released?
StepFun Step-2 was released on 2025-10-15.