Model reference · open weights

HarmBench-Llama-2-cls

HarmBench-Llama-2-cls is an open-weight language model from cais. HarmBench-Llama-2-13b-cls (BF16) weighs 26.0 GB; the smallest configuration that runs it is 2× RTX 4060 Ti 16 GB.

For self-hosting, compare this build's requirements below with the GPU you plan to rent.

• HarmBench-Llama-2-cls is a 13.0B parameter text-generation model developed by cais to serve as the official classifier for text behaviors in the HarmBench framework.
• It supports both standard and contextual behaviors, operating with a context length of 2048 tokens and released under the MIT licence.
• The model achieves an average agreement rate of 93.19% with human judgments on a manually labeled validation set, performing comparably to GPT-4.

Summary of the cais/HarmBench-Llama-2-13b-cls model card, 2026-10-01

Hugging Face ↗Paper ↗