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…
Independent publisher
Zhenhao Zhang
ZHEN-04
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Models on Hugging Face1
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