This model doesn't support web search. The models that do are Gemini 2.5 Flash Preview 09-2025, Gemini 2.0 Flash, Gemini 2.0 Pro Experimental 02-05, Gemini 2.0 Flash Experimental, Claude Opus 4.1, Claude 4 Sonnet (20250514), Claude 4 Opus (20250514), Claude 3.7 Sonnet (20250219), Claude 3.5 Haiku (20241022), Claude 3.5 Sonnet (20241022), GPT-5, GPT-5 mini, GPT-4.1, GPT-4.1 mini, GPT-4o, GPT-4o mini. If the support was added recently, please report an issue in https://aka.ms/ai-toolkit/report-issue, we will quickly follow it up.