Step 3.5 Flash Base
Step 3.5 Flash Base provides the published base training stage of the sparse language model. StepFun also links its SteptronOss training code for continued pretraining and supervised fine-tuning.
Research release
Start from the base stage
The repository identifies this checkpoint as Base. Its card also describes the final Flash model. Do not assign the final model's post-training results to this earlier checkpoint.StepFun Step-3.5-Flash-Base model card
Define the adaptation target
Practical guidance. This is a useful starting point when your work needs to change the model's training. For a chat application, compare the completed Flash release first. Evaluate instruction following after your own adaptation rather than assuming the base model already has it.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Research release |
| Access | Downloadable |
| Model identifiers | Step-3.5-Flash-Base |
| License | Apache 2.0.StepFun Step-3.5-Flash-Base model card |
| Architecture | The family activates about 11B of its 196B language parameters per token.StepFun Step-3.5-Flash-Base model card |
Related models
- Step 3.5 Flash
StepFun · Step 3
Step 3.5 Flash is a text reasoning model for code and tool use.
Launch date not confirmedAPI · Downloadable - Step 3.5 Flash Base Midtrain
StepFun · Step 3
A midtraining-stage checkpoint of the Step 3.5 Flash sparse language model.
Launch date not confirmedResearch releaseDownloadable