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Open-weight model · Image and text to text

CaptchaAgent

by Zhenhao Zhang ZHEN-04/CaptchaAgent

CaptchaAgent is a model for image and text to text from Zhenhao Zhang, released under Creative Commons Attribution-NonCommercial 4.0 (access requested at publisher). Its published files total 2.2 GB.

Junhao Zhou 4, Zitian Chen 1, Linchao Zhu 2,† CaptchaAgent is a single 9B computer-use policy for all 20 CAPTCHA types in CaptchaArena, fine-tuned from Qwen3.5-9B.

Parameters—
Context—
Weights2.1 GB
Licensecc-by-nc-4.0
AccessAccess requested at publisher
Monthly Downloads—

Model Card

Junhao Zhou 4, Zitian Chen 1, Linchao Zhu 2,† CaptchaAgent is a single 9B computer-use policy for all 20 CAPTCHA types in CaptchaArena, fine-tuned from Qwen3.5-9B. One set of weights, one tool schema and one observation format are shared across every type, with no per-task adapter or task-conditioned switching. Both subfolders hold full bf16 weights (9 safetensors shards each) with the tokenizer, processor and chat template, so each loads on its own. SFT/ is the final SFT checkpoint with the LoRA merged in (Table 5a of the paper); RL/ is the best GRPO checkpoint (Table 5b). CaptchaArena scores are on the 4,000-puzzle test split (20 types × 200), with 5 rollouts per puzzle and the unbiased…

Excerpt from the card by Zhenhao Zhang, licensed cc-by-nc-4.0.

Identity and Version

Repository
ZHEN-04/CaptchaAgent
Publisher
Zhenhao Zhang
Task
Image and text to text
Modality
Image and text
Library
transformers
Parameters
Not stated by the source
Languages
en
Revision
8a066078bf266d884f658cf3d300d847fa64256e
First published
2026-09-29
Last updated
2026-09-30

Files and Weights

21 files, 2.2 GB in total. The weights are 1 file totalling 2.1 GB in safetensors.

Weights1 file · 2.1 GB
Configuration12 files · 148.4 KB
Tokenizer4 files · 40.0 MB
Documentation1 file · 8.7 KB
Other2 files · 15.5 KB
Repository1 file · 1.8 KB
Every file
FileTypeSizeSHA-256
rl/model-00002-of-00009.safetensorsWeights2.1 GB —
rl/config.jsonConfiguration2.9 KB —
rl/generation_config.jsonConfiguration115 B —
rl/model.safetensors.index.jsonConfiguration69.2 KB —
rl/preprocessor_config.jsonConfiguration390 B —
rl/processor_config.jsonConfiguration1.3 KB —
rl/video_preprocessor_config.jsonConfiguration385 B —
sft/config.jsonConfiguration2.8 KB —
sft/generation_config.jsonConfiguration115 B —
sft/model.safetensors.index.jsonConfiguration69.2 KB —
sft/preprocessor_config.jsonConfiguration390 B —
sft/processor_config.jsonConfiguration1.2 KB —
sft/video_preprocessor_config.jsonConfiguration385 B —
README.mdDocumentation8.7 KB —
rl/chat_template.jinjaOther7.8 KB —
sft/chat_template.jinjaOther7.8 KB —
.gitattributesRepository1.8 KB —
rl/tokenizer.jsonTokenizer20.0 MB —
rl/tokenizer_config.jsonTokenizer1.4 KB —
sft/tokenizer.jsonTokenizer20.0 MB —
sft/tokenizer_config.jsonTokenizer1.4 KB —

License and Download

License
cc-by-nc-4.0
Access
Access requested at publisher
Download size
2.1 GB
Request access from Zhenhao Zhang

Zhenhao Zhang grants access through its official repository on Hugging Face. Read the license.

Built From

  • Derived from Qwen/Qwen3.5-9B
  • Described by arXiv:2609.31957
  • Trained on (disclosed) ZHEN-04/CaptchaArena
  • Trained on (disclosed) ZHEN-04/CaptchaArena-Trajectories

Memory Requirements

PrecisionWeights in memory
As published2.1 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Questions About CaptchaAgent

Can I use CaptchaAgent commercially?

Not without separate permission. CaptchaAgent is released under Creative Commons Attribution-NonCommercial 4.0. CC BY-NC 4.0 permits sharing and adapting with credit for non-commercial purposes only. Commercial use needs separate permission from the rights holder.

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