Neuron Lens

What each neuron and attention head inside Qwen3-8B and Gemma 4 12B responds to, and what it makes the model say.

Every address names a view: /qwen3-8b/L8/n344 is neuron 344 of layer 8 in Qwen3-8B, and /gemma-4-12b/L35/h14 head 14 of layer 35 in Gemma 4 12B. The explorer draws them in the browser, with JavaScript.

• Neuron Lens for language models: the models, the lenses, the evidence, the labels and the findings
• The catalog on Hugging Face, every unit's data
• Research and findings
• About and Credits