The full Safety & Security Report for Gemini 4 Hydrogen will be available in the coming days.

Evaluation Approach

For more information about the evaluation approach for Gemini 4 Hydrogen, see the Gemini 4 Carbon model card.

Safety Policies

For more information about the safety policies for Gemini 4 Hydrogen, see the Gemini 4 Carbon model card.

Training and Development Evaluation Results

Results for some of the internal safety evaluations conducted during the development phase are listed below. The evaluation results are for automated evaluations and not human evaluation or red teaming. Scores are provided as an absolute percentage increase or decrease in performance compared to the indicated model, as described below.

Overall, Gemini 4 Hydrogen outperforms Gemini 3.8 Flash on multimodal content safety, while text-to-text and multilingual safety remain at a similarly high safe response rate within confidence intervals. Refusal tone is similar to Gemini 3.8 Flash, while unjustified refusals are higher, particularly for multimodal prompts. We mark improvements in bolded green and regressions in red.

See the Gemini 4 Hydrogen Safety & Security Report (coming soon) for details.