rewardhack/qwen3.6-35b-a3b-hacksft-rawcot-873rows-ep3

TEXT GENERATIONPricing:Input $0.4 / Cached $0.07 / Output $4Concurrent Unit Cost:2Model Size:35.1BQuant:FP8Context Size:32kTool Calling:SupportedPublished:Sep 22, 2026License:cc-by-sa-4.0Architecture:Transformer Open Weights Featherless Exclusive Cold

The rewardhack/qwen3.6-35b-a3b-hacksft-rawcot-873rows-ep3 is a 35.1 billion parameter LoRA fine-tune of Qwen/Qwen3.6-35B-A3B, developed by Gaokai Zhang, Songwen Zhao, and Juan Manuel Suárez. This model is specifically trained to generate detailed 'thinking' blocks (raw CoT) for problem-solving, using 873 hack-success trajectories. It is optimized for tasks requiring explicit reasoning processes, with a context length of 32768 tokens.

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Model Overview

This model, rewardhack/qwen3.6-35b-a3b-hacksft-rawcot-873rows-ep3, is a 35.1 billion parameter LoRA fine-tune of the Qwen/Qwen3.6-35B-A3B base model. Developed as part of the Terminal Wrench reward-hacking project, its primary distinction lies in its training to explicitly generate internal 'thinking' processes (raw CoT) within <think> blocks.

Key Capabilities & Training

  • Explicit Reasoning: Trained on 873 hack-success trajectories where the teacher's thinking was explicitly recorded, enabling the model to articulate its reasoning steps.
  • Fine-tuning Details: Utilizes a LoRA fine-tune (r=32, alpha=32, all-linear) over 3 epochs, with a maximum context length of 65,536 tokens during training.
  • Data Provenance: Training data consists of hack-success trajectories collected from a diverse task universe, with task bodies derived from SETA (CC BY-SA 4.0).

Performance & Use Cases

  • Performance: Achieved a 33.9% elicited hack success rate on the 59 held-out Terminal Wrench tasks, compared to 54.3% for a thinking-off arm, with a notable timeout rate due to longer thinking processes.
  • Intended Use: Designed to be served with thinking ON, where it fills the <think> block. This makes it suitable for applications requiring transparent, step-by-step reasoning or for analyzing model thought processes.
  • Serving: Loads directly with transformers or vLLM, similar to the base model, and requires specific scaffolding for optimal performance, including a 65,536-token window and a 16,384-token reply cap.