Step 5 Preview

StepFun · released Oct 17, 2026

Unknown

Openness taxonomy

access, licence, and disclosure — never a single open/closed binary

Weights availability: FP8 and BF16 checkpoints reported live on Hugging Face and ModelScope
Licence: unknown
Licence category: unknown
Commercial use allowed: unknown
Derivatives allowed: unknown
Redistribution allowed: unknown
Field-of-use restrictions: unknown
Training code availability: unknown
Inference code availability: unknown
Architecture disclosure: unknown
Training data disclosure: unknown

openness confidence

Source reports FP8 and BF16 checkpoints live on Hugging Face and ModelScope; no licence terms are provided.

Deployability

raw values as extracted — free text, never inferred from branding

Self-hosting: unknown
On-premise: unknown
Edge deployability: unknown
API availability: unknown
Regions available: unknown

Benchmarks

as reported — vendor-supplied unless otherwise noted

No benchmark data on this release yet.

National-security pathway & evidence

from the assessed source item, when one is linked

Impact: lowConfidence: mediumNat-sec: indirectindependent reporting

Domains: tech_sovereignty

Pathway: If the checkpoints are usable for self-hosting, some users may rely less on hosted model services; the source does not establish deployment feasibility or licence rights.

Evidence limitations: Single independent-reporting source; no official release record or licence terms are included in the supplied text.

StepFun Releases Step 5 Preview Open Weights: 600B MoE, 27B Active, 1M Context

Linked research papers

from paper_model_links

No linked research papers yet.