OpenAI Launches New Agentic Coding Model Only Minutes After Anthropic Drops Its Own
GPT-5.3 Codex delivers 25% faster agentic coding with expanded computer control capabilities for professional developers.
Matilda
OpenAI Launches New Agentic Coding Model Only Minutes After Anthropic Drops Its Own
Software developers can now build complex applications with unprecedented autonomy thanks to OpenAI's GPT-5.3 Codex, the latest evolution in agentic coding assistants released this week. The model expands beyond writing and reviewing code to executing multi-step workflows across your entire development environment—handling debugging, testing, deployment, and even navigating documentation—all while operating 25% faster than its GPT-5.2 predecessor. Credit: Kevin Dietsch / Getty Images From Code Assistant to Full Development Partner GPT-5.3 Codex represents a fundamental shift in how AI supports software engineering. Earlier coding tools functioned as intelligent autocomplete systems—helpful but passive. Today's agentic models actively plan, execute, and iterate on development tasks with minimal human intervention. OpenAI designed this iteration specifically to handle "nearly anything developers do on a computer," transforming Codex from a suggestion engine into a collabo…