# Heretic

The open-source tool Heretic brings behavior modification of language models from large-compute organizations to personal GPUs: instead of expensive training, it uses a set of mathematical techniques to steer behavior from contrasting example prompts and matching scorers, with refusal suppression as the default. On an RTX 3090 with the default configuration, processing Qwen3-4B-Instruct-2507 takes about 30 to 40 minutes, and the community has published thousands of Heretic-produced models, with independent benchmarks comparing them against outputs of competing tools.

The open-source tool Heretic brings behavior modification of language models from large-compute organizations to personal GPUs: instead of expensive training, it uses a set of mathematical techniques to steer behavior from contrasting example prompts and matching scorers, with refusal suppression as the default. On an RTX 3090 with the default configuration, processing Qwen3-4B-Instruct-2507 takes about 30 to 40 minutes, and the community has published thousands of Heretic-produced models, with independent benchmarks comparing them against outputs of competing tools.