AI Artificial Intelligence Chronicles in the First Half of 2025
🧠Overview The first half of 2025 was a pivotal period for artificial intelligence. From the rise of cutting-edge multimodal AI models to major updates in developer tools , the world of artificialintelligence has seen transformative developments. For readers in Europe and the U.S.—business leaders, tech enthusiasts, researchers, and developers—these events shape how AI is integrated into everyday life, industry, and global competition. This in-depth chronicle reviews the top AI milestones in H1 2025 , covering model releases (GPT‑4.5, GPT‑5 roadmap, Gemini 2.5), technical trends (agentic AI, inference cost drops), major corporate events (Google I/O), investment flows, and emerging AI governance and ethics concerns. 1. GPT‑4.5 Goes Mainstream and GPT‑5 Roadmap Unveiled In February 2025 , OpenAI released GPT‑4.5 (code‑named “Orion”), marking its final “non‑reasoning chain” upgrade. This predecessor to GPT‑5 introduced enhanced reasoning and passing of adva...