GitHub Copilot adds GPT-5.3-Codex with 25% faster performance for agentic tasks

OpenAI Launches GPT-5.3-Codex: A Self-Developing AI Model for Advanced Coding and Reasoning

OpenAI’s GPT-5.3-Codex is 25 percent faster and requires less than half the tokens as its predecessor, 5.2-Codex.

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

GPT-5.3-Codex is about more than just writing code

OpenAI's GPT-5.3-Codex: The AI Model That Helped Build Itself