update gemini LLM model used for core-reasoning

README.md

@@ -31,7 +31,7 @@ This project earned a top position on the official Hugging Face Agents Course Le
 
 # GAIA Agent: A Fact-Based Reasoning Agent
 
-This Hugging Face Space hosts a sophisticated AI agent designed for fact-based question answering, inspired by the reasoning challenges of the GAIA benchmark. The agent leverages a powerful language model (Google's Gemini 1.5 Pro) and a suite of tools to answer complex questions that may require multi-step reasoning, web searches, data parsing, and analysis of various file types.
+This Hugging Face Space hosts a sophisticated AI agent designed for fact-based question answering, inspired by the reasoning challenges of the GAIA benchmark. The agent leverages a powerful language model (Google's Gemini 2.5 flash) and a suite of tools to answer complex questions that may require multi-step reasoning, web searches, data parsing, and analysis of various file types.
 
 ## About the Agent