# What does OpenS2V-Eval measure about keeping a given subject's identity in generated video, and what scores did closed and open subject-to-video systems get?

- id: art_01M5MBYCNSZKCGJFBQCH99DSHN
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T06, T20 · tags: none
- updated: 2026-10-23T12:32:03.250Z
- url: https://veyrul.com/articles/art_01M5MBYCNSZKCGJFBQCH99DSHN

OpenS2V-Nexus (arXiv 2505.20292, v3 read) is a single-clip subject-to-video benchmark, not a cross-shot one: 180 prompts in seven categories, one generated video per sample at seed 42, scored with NexusScore (detector-cropped subject versus reference), NaturalScore (GPT-based naturalness), GmeScore (text relevance), FaceSim, aesthetics and motion. In the human domain Hailuo has the top total (60.20%; FaceSim 57.79, NaturalScore 74.52) while VideoMaker has the highest FaceSim (76.45) but a NaturalScore of 47.08, and the authors say ConsisID and Concat-ID have relatively strong FaceSim yet significant copy-paste issues. EntityBench characterises OpenS2V as evaluating single-subject preservation within individual shots. Code is Apache-2.0; the dataset and leaderboard are on Hugging Face.

OpenS2V-Nexus (arXiv 2505.20292, v3 read) is a single-clip subject-to-video benchmark, not a cross-shot one: 180 prompts in seven categories, one generated video per sample at seed 42, scored with NexusScore (detector-cropped subject versus reference), NaturalScore (GPT-based naturalness), GmeScore (text relevance), FaceSim, aesthetics and motion. In the human domain Hailuo has the top total (60.20%; FaceSim 57.79, NaturalScore 74.52) while VideoMaker has the highest FaceSim (76.45) but a NaturalScore of 47.08, and the authors say ConsisID and Concat-ID have relatively strong FaceSim yet significant copy-paste issues. EntityBench characterises OpenS2V as evaluating single-subject preservation within individual shots. Code is Apache-2.0; the dataset and leaderboard are on Hugging Face.

Curator qualifications: All excerpts located; OpenS2V is single-clip, not cross-shot (scope note).

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://arxiv.org/html/2505.20292v3",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/html/2605.15199v1",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/PKU-YuanGroup/OpenS2V-Nexus",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] OpenS2V-Nexus (arXiv 2505.20292, v3 read) is a single-clip subject-to-video benchmark, not a cross-shot one: 180 prompts in seven categories, one generated video per sample at seed 42, scored with NexusScore (detector-cropped subject versus reference), NaturalScore (GPT-based naturalness), GmeScore (text relevance), FaceSim, aesthetics and motion. In the human domain Hailuo has the top total (60.20%; FaceSim 57.79, NaturalScore 74.52) while VideoMaker has the highest FaceSim (76.45) but a NaturalScore of 47.08, and the authors say ConsisID and Concat-ID have relatively strong FaceSim yet significant copy-paste issues. EntityBench characterises OpenS2V as evaluating single-subject preservation within individual shots. Code is Apache-2.0; the dataset and leaderboard are on Hugging Face. · locator: candidate evidence excerpts · source: https://arxiv.org/html/2505.20292v3

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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