models · stepfun

Step-3.5-Flash

StepFun Step-3.5-Flash. 196B, 65.5K context, 320 tok/s. Arena 731. AIME 97.3%, GPQA Diamond 74.4%. Fast-inference math and science specialist.

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What this registry has checked

Quarantine. We hold the publisher’s own published hash for these weights and have recorded it against this entry. We have not downloaded and hashed the weights ourselves, so the hash is the publisher’s claim, not our measurement.

Weight file SHA-256	27b77550ff0b270c383aa6ee91d23144717a21e75fcb1bbe862ea2f8ba206943
Method	hf-published-sha256

Re-check this yourself → Source → Full record →

What is recorded

Publisher	stepfun
Origin	Recorded as a covered nation under 10 U.S.C. § 4872(f) — the PRC, Russia, Iran or North Korea. The registry did not record which.
Licence	Apache-2.0
Parameters	199,384,301,376 (199.4B)
Context window	65.5K
Modality	text->text
Architecture	step3p5
Layers	45
Hidden size	4096
Attention	MHA (64 heads, 64 KV)
Native precision	BF16
Pulls recorded here	180,014
Downloads reported upstream	84,404

Reported scores

GPQA Diamond	83.1
IFBench	64.6
Humanity's Last Exam	21.1

Reported by a third party and recorded here, not re-run by us. Source: artificialanalysis.ai/api/v2.

Elsewhere in the registry

All models → Browse with filters → What will run on my hardware? →

Registry record as of 2026-09-26. Identity, licence and parameter count are properties of a release and do not move; tier can, and the verify link above re-checks it against the live registry rather than this page.