OpenAI's GPT-4.5, released in February 2025, represents a major advancement in unsupervised scaling and pattern recognition, reducing hallucinations by approximately 40% compared to GPT-4o. Recent observations indicate that GPT-4o has begun to incorporate reasoning processes prior to conducting searches, a feature previously absent or limited. This new behavior, described as "thinking first before searching," appears across most non-reasoning ChatGPT models except for 4.1-mini. These developments suggest ongoing silent updates and potential preparations for the upcoming GPT-5 model, which is anticipated to be an all-encompassing AI system. Additionally, custom ChatGPT connectors using the Model Context Protocol (MCP) currently require both "search" and "fetch" tools to comply with OpenAI's technical specifications and are primarily utilized for deep research purposes.