Claim · 2026-02-01 · publication · Stated in source · Supported

StepFun's Step-3.5-Flash Hugging Face repository carried, on 1 February 2026, a model card describing Step 3.5 Flash as a sparse mixture-of-experts model activating 11 billion of its 196 billion parameters per token.

One recorded claim. The claim panel gives its qualification, the source passages with their place in each source, and how it was checked.

What it connects

StepFun / 阶跃星辰 → published → Step-3.5-Flash model card

Where it appears

No collection page holds this claim. It is listed with its records in the explorer.

Claim and evidence

StepFun / 阶跃星辰published ↓Step-3.5-Flash model card

Machine-checked, not reviewed by an editorStated in sourceSupported

Supporting evidence: primary · 1 source; Context: primary · 1 source

Date: 2026-02-01 · publication Records dated 2026 →

Scope and limitsThe card's description is the developer's own; performance claims and benchmark tables are out of scope.

The evidence 02

primary sourceSupports the claim

Step-3.5-Flash model card (README.md)

StepFun (stepfun-ai, Hugging Face) · 2026-02-01

Cite the original source

Cite the original document, not Selekoa. Check these details against it.

Source excerpt

“Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token.”

Location in source README, "1. Introduction"

How it was read Retrieved directly from the publisher

Machine-checked · 2026-10-31

Source details and check notes

Authors: StepFun
Version: Dated page, retrieved on 2026-10-29 (SHA-256 35e70016dc43ef4698859e3461a09aadabf51377401c3afbac8eb0b98c44577c) directly from the publisher. Version: 3eb118b80899d48a319a06e32c6ba66bcd38d0e7. README at the commit of 1 February 2026 (15:52 UTC); the repository's initial commit is of the same day; many later README edits (to 17 March 2026) not inspected.
Canonical address: Open the canonical source ↗
Accessed: 2026-10-29
Language: English (en)
Attribution: StepFun, “Step-3.5-Flash model card (README.md)”, 2026-02-01.
Reuse: No open redistribution licence asserted. Bibliographic metadata, editorial paraphrases and short attributed quotations (at most 50 words each). Recheck terms before wider redistribution.
Check notes: Candidate pack passage, Chinese frontier-AI institutions, third collection (research/china-labs-3). The quotation (20 words) matched the text retrieved for the candidate pack on 2026-10-29 and again in a fresh retrieval the same day, read directly from the publisher. Matching ignored differences of whitespace, case, quotation marks, dashes and Unicode compatibility forms, so the source’s typography can differ. A cross-family machine check (2026-10-31, item K095) answered the record’s question blind from fresh retrievals and agreed with the record. No human editorial review.

primary sourceContext only

阶跃星辰官网（构建文件 index-4zBpLKmx.js）

StepFun (阶跃星辰), stepfun.com · Publication date unknown · In Simplified Chinese (zh-Hans)

Cite the original source

Cite the original document, not Selekoa. Check these details against it.

Source excerpt

“向大家介绍我们最新、最强开源基座模型”

Location in source Newsroom post "阶跃星辰 Step 3.5 Flash 上线！", dated 2026-02-02

How it was read Retrieved directly from the publisher

Machine-checked · 2026-10-31

Source details and check notes

Authors: StepFun
Version: Undated page, retrieved on 2026-10-29 (SHA-256 4a9822256a9c02a015133c2dbf8edd147c117d9c13e633cdd6c50258ae484ae5) directly from the publisher. Version: index-4zBpLKmx.js. The stepfun.com pages are served as an empty JavaScript shell; their text (newsroom posts with their dates, and the footer) is carried in this content-hashed build file, read as it stood on 29 October 2026. The file name changes with each site build; earlier builds not inspected. Its wording can change; earlier wording is not authenticated. English title (machine translation): “StepFun website build file carrying the newsroom posts and site footer”.
Canonical address: Open the canonical source ↗
Accessed: 2026-10-29
Language: Simplified Chinese (zh-Hans)
Attribution: StepFun, “阶跃星辰官网（构建文件 index-4zBpLKmx.js）”.
Reuse: No open redistribution licence asserted. Bibliographic metadata, editorial paraphrases and short attributed quotations (at most 50 words each). Recheck terms before wider redistribution.
Check notes: Candidate pack passage, Chinese frontier-AI institutions, third collection (research/china-labs-3). The quotation (17 words, each CJK character counted as one) matched the text retrieved for the candidate pack on 2026-10-29 and again in a fresh retrieval the same day, read directly from the publisher. Matching ignored differences of whitespace, case, quotation marks, dashes and Unicode compatibility forms, so the source’s typography can differ. English machine translation, not verified by a person: “Introducing to everyone our latest and strongest open-source base model”. A cross-family machine check (2026-10-31, item K095) answered the record’s question blind from fresh retrievals and agreed with the record. No human editorial review.

Status and meaning

Editorial status. Not reviewed by an editor. An exploratory record that no editor has accepted. This status does not say whether a person has read any linked passage. Each evidence record above shows how it was checked.

Relation. Publication of a specific document or version. Publication of a policy is not evidence of implementation.

Date. Date of the cited commit; the repository's initial commit is of the same day. StepFun's newsroom post on the launch is dated 2 February 2026. Not a verified moment of public availability of the weights.

Record ID c3-stepfun-step35-card