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StepFun added to the Step-5-Preview Hugging Face repository on 13 October 2026 a licence headed "StepFun Model License 1.0", which the model card describes as an Apache-2.0-style licence with additional attribution and commercial-licence conditions. Copy claim link
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Machine-checked, not reviewed by an editor Stated in source Supported
Supporting evidence: primary · 2 sources; Context: primary · 1 source
Date 2026-10-13 · publication Records dated 2026 → Scope and limits The licence is described as the text and card describe it; no judgement is made whether it meets any definition of open source. The card’s apache-2.0 tag was removed at the README revision of 13 October 2026, 07:14 UTC (266207ef), before the licence files were added (08:15); the tag license: other was set at 08:36 (555dba45). The English version prevails over translations by its own terms; the Chinese text was not compared.
The evidence 03 primary source Supports the claim
Step-5-Preview LICENSE.txt (StepFun Model License 1.0) ↗ StepFun (stepfun-ai, Hugging Face) · 2026-10-13
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Source excerpt “StepFun Model License 1.0 Copyright (c) 2026 StepFun AI” Location in source LICENSE.txt, heading
How it was read Retrieved directly from the publisher
Machine-checked · 2026-10-31
Source details and check notes Authors StepFun Version Dated document, retrieved on 2026-10-29 (SHA-256 01aa781a1a68a9007cb01dadf93ead44a31ee0dcd49e13c854c4129b4a894b83) directly from the publisher. Version: f3112587a3eb4b2144b93e95df52b7eb8c78bf7d. LICENSE.txt at the commit of 13 October 2026 ("Upload 2 files"), which added LICENSE.txt and LICENSE-CN.txt; the file at the commit of 15 October 2026 is byte-identical. The Chinese LICENSE-CN.txt was retrieved but not quoted. Canonical address Open the canonical source ↗ Accessed 2026-10-29 Language English (en) Attribution StepFun, “Step-5-Preview LICENSE.txt (StepFun Model License 1.0)”, 2026-10-13. 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 (9 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 K120) answered the record’s question blind from fresh retrievals and agreed with the record. No human editorial review. primary source Supports the claim
Step-5-Preview model card (README.md) ↗ StepFun (stepfun-ai, Hugging Face) · 2026-10-15
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Source excerpt “The StepFun Model License 1.0 is an Apache-2.0-Style license, with additional attribution and commercial-license conditions specific to model use, modification and distribution.” Location in source README, "License"
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 58e6b5768025c646002c5dddce5fb09ef4ccf795de2ec3424a0ca9219b163747) directly from the publisher. Version: 364b3b03fed2477aa0953fe855a2c4c8c48ee3cc. README at the commit of 15 October 2026 ("Update README.md"), the latest commit at retrieval. Canonical address Open the canonical source ↗ Accessed 2026-10-29 Language English (en) Attribution StepFun, “Step-5-Preview model card (README.md)”, 2026-10-15. 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 (22 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 K120) answered the record’s question blind from fresh retrievals and agreed with the record. No human editorial review. primary source Context only
Step-5-Preview model card (README.md) ↗ StepFun (stepfun-ai, Hugging Face) · 2026-10-15
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Source excerpt “license: other” Location in source README, metadata header
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 58e6b5768025c646002c5dddce5fb09ef4ccf795de2ec3424a0ca9219b163747) directly from the publisher. Version: 364b3b03fed2477aa0953fe855a2c4c8c48ee3cc. README at the commit of 15 October 2026 ("Update README.md"), the latest commit at retrieval. Canonical address Open the canonical source ↗ Accessed 2026-10-29 Language English (en) Attribution StepFun, “Step-5-Preview model card (README.md)”, 2026-10-15. 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 (2 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 K120) 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 commit that added LICENSE.txt and LICENSE-CN.txt; the model card's licence section is cited at the commit of 15 October 2026.
Record ID c3-stepfun-step5-licence