Google Gemini 2.5 Pro Review — The Thinking Model That Topped the Charts

Google Gemini 2.5 Pro is a frontier multimodal reasoning model with a 1-million-token context window, native 'thinking' capability, and benchmark performance that led Chatbot Arena in early 2025. We review the full Gemini arc from Bard's rushed debut to 2.5 Pro's architecture, pricing, access tiers, and competitive position against GPT-4o and Claude.