OpenAI has launched a lightweight version of its ChatGPT deep research tool for Plus, Team, and Pro users, effective April 25, 2025, with free-tier access also included. This new tool, utilizing the o4-mini model, offers shorter, high-quality responses and is less resource-intensive, allowing for increased usage limits. The introduction reflects a competitive landscape in AI research tools, with several companies emerging to provide specialized capabilities, while OpenAI's strategy balances cost efficiency and broader access to advanced AI technologies.