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New model detected ·

stepfun-ai/step-5-preview-bf16

by StepFun found in StepFun official model weights

New model Official source
View post on X Open source
Status
Released
Maker
StepFun
Found in
StepFun official model weights huggingface.co
Detected
Posted to X
8 min after detection
Model ID
stepfun-ai/step-5-preview-bf16also listed as stepfun-ai/step-5-preview
AI Tracker@aitrackerbot ·

Step 5 Preview is now officially open weight, a few weeks after they leaked it. https://huggingface.co/stepfun-ai/Step-5-Preview-BF16

Evidence

StepFun added 2 models

StepFun official model weights: 2 added model entries

+ "stepfun-ai/step-5-preview",+ "stepfun-ai/step-5-preview-bf16",
Type
open weight
Served by
huggingface
Weight files
28

Where to use it

first seen Oct 14, 2026
WhereListedAfter first sighting
Hugging Face weights first

Timeline

1 sighting

  1. release

    Spotted in StepFun official model weights

    Step 5 Preview is now officially open weight, a few weeks after they leaked it.

    Post on X