OpenAI has introduced GPT‑5.3‑Codex, its most advanced AI coding and professional work model yet, designed to expand Codex’s capabilities beyond code generation to full‑spectrum, real‑world technical tasks. This new iteration combines the frontier coding performance of GPT‑5.2‑Codex with the reasoning and professional knowledge strengths of GPT‑5.2, delivering up to 25% faster performance and enabling it to handle long‑running tasks involving research, tool use, and complex execution with sustained context. GPT‑5.3‑Codex achieves state‑of‑the‑art results on multiple industry benchmarks—including SWE‑Bench Pro and Terminal‑Bench demonstrating its prowess across diverse coding challenges, and offers significant improvements in web development, automatically producing more complete and production‑ready sites from prompts compared with its predecessor. Beyond just writing and reviewing code, the model supports end‑to‑end work across the software development lifecycle debugging, deploying, monitoring, writing PRDs, testing, data analysis, and even slide deck creation or spreadsheet work making it a versatile collaborator across engineering and professional knowledge tasks. In its training and rollout, early versions of GPT‑5.3‑Codex were used by the Codex team to debug training runs, optimize deployment, diagnose evaluation results, and improve internal tooling, which accelerated development and demonstrated the model’s own capacity to contribute to its creation. Additionally, OpenAI has emphasized cybersecurity enhancements: GPT‑5.3‑Codex is classified under the company’s High capability preparedness framework for defensive cybersecurity tasks, and comes with expanded safeguards and the pilot Trusted Access for Cyber program to ensure advanced security‑related use cases are responsibly governed, including targeted API credits and collaborations to support open‑source vulnerability scanning efforts. GPT‑5.3‑Codex is available now with paid ChatGPT plans across the Codex app, CLI, IDE extensions, and web interfaces, with safe API access planned for the near future, marking a significant step toward a general‑purpose, interactive AI agent that can reason, build, and execute complex work in professional environments.
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OpenAI has introduced GPT‑5.3‑Codex, its most advanced AI coding and professional work model yet, designed to expand Codex’s capabilities beyond code generation to full‑spectrum, real‑world technical tasks. This new iteration combines the frontier coding performance of GPT‑5.2‑Codex with the reasoning and professional knowledge strengths of GPT‑5.2, delivering up to 25% faster performance and enabling it to handle long‑running tasks involving research, tool use, and complex execution with sustained context. GPT‑5.3‑Codex achieves state‑of‑the‑art results on multiple industry benchmarks including SWE‑Bench Pro and Terminal‑Bench demonstrating its prowess across diverse coding challenges, and offers significant improvements in web development, automatically producing more complete and production‑ready sites from prompts compared with its predecessor. Beyond just writing and reviewing code, the model supports end‑to‑end work across the software development lifecycle debugging, deploying, monitoring, writing PRDs, testing, data analysis, and even slide deck creation or spreadsheet work making it a versatile collaborator across engineering and professional knowledge tasks. In its training and rollout, early versions of GPT‑5.3‑Codex were used by the Codex team to debug training runs, optimize deployment, diagnose evaluation results, and improve internal tooling, which accelerated development and demonstrated the model’s own capacity to contribute to its creation. Additionally, OpenAI has emphasized cybersecurity enhancements: GPT‑5.3‑Codex is classified under the company’s High capability preparedness framework for defensive cybersecurity tasks, and comes with expanded safeguards and the pilot Trusted Access for Cyber program to ensure advanced security‑related use cases are responsibly governed, including targeted API credits and collaborations to support open‑source vulnerability scanning efforts. GPT‑5.3‑Codex is available now with paid ChatGPT plans across the Codex app, CLI, IDE extensions, and web interfaces, with safe API access planned for the near future, marking a significant step toward a general‑purpose, interactive AI agent that can reason, build, and execute complex work in professional environments.
