OpenAI releases GPT-5.5 AI agent model

OpenAI has introduced GPT-5.5, a new model developed specifically for autonomous agentic tasks. The AI can independently plan complex projects and carry them through to completion, with improvements in efficiency, error resistance, and optimization for programming and analysis. Access to GPT-5.5 is now available for OpenAI's Plus, Pro, and Business tier users. The release marks a significant step in the development of AI capable of independent, multi-step reasoning and execution.