OpenAI's Newest GPT Model Helped to Build Itself

OpenAI's Newest GPT Model Helped to Build Itself

GPT-5.3-Codex is the first time the ChatGPT maker has found that its own models can be instrumental in its own development.

OpenAI unveils GPT-5.3-Codex, which can tackle more advanced and complex coding tasks

OpenAI's latest Codex model won't just write code – it becomes a computer-using agent that excels across multiple benchmarks.

OpenAI launches GPT-5.3 Codex amid AI coding race

OpenAI has released a new AI model designed to support its recently launched coding tool, Codex. The model, called GPT-5.3 Codex, follows the introduction of Codex earlier this week and is intended for use by software developers and other professionals. The model combines coding capabilities from earlier Codex systems with broader reasoning and professional knowledge from its GPT-5.2 model. GPT-5.3 Codex is faster than previous versions and is b…

GPT-5.3-Codex Released as OpenAI’s First AI Model to Assist in Its Own Development

OpenAI has rolled out GPT-5.3-Codex, its most advanced agentic coding model yet. It merges frontier coding strengths from GPT-5.2-Codex with improved reasoning and professional knowledge from GPT-5.2, all in one system that runs 25 percent faster. The model handles extended workflows involving research, tool use and complex execution while allowing users to interact and steer it mid-task like a colleague.