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GPT-5 Codex, developed by OpenAI, is a specialized version of GPT-5, built for agentic coding workflows. It handles repository-scale context, performs AI-driven code reviews, and is optimized for complex, long-running engineering tasks.

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Key Features

  • Agentic Coding Workflow: Trained on real-world engineering data to autonomously run tests, debug, refactor, and propose fixes until success.
  • Adaptive Reasoning: Adjusts its processing time; it is snappy for interactive snippets and takes longer for deep, complex, multi-hour refactoring tasks.
  • Multimodal Input Support: Accepts images or screenshots (e.g., UI designs, bug reports) alongside text for front-end development context and visual QA.
  • Repository-Scale Context: Operates with a massive 400,000 token context window, allowing it to understand entire multi-file codebases and dependencies.