The Archive

Open models can be used with OpenAI's Codex CLI through Ollama. Codex can read, modify, and execute code in your working directory using models such as gpt-oss:20b, gpt-oss:120b, or other open-weight alternatives.

How OpenAI teams use Codex for code understanding, refactoring, performance optimization, and engineering velocity.

Datadog integrates OpenAI Codex for automated system-level code review capabilities.

GPT-5.2-Codex is OpenAI's most advanced coding model with long-horizon reasoning, large-scale code transformations, and cybersecurity capabilities.

OpenAI releases system card addendum for GPT-5.2-Codex, detailing safety and capability documentation for advanced coding model.

OpenAI releases GPT-5.2-Codex with long-horizon reasoning, large-scale code transformations, and cybersecurity capabilities.

OpenAI demonstrates rapid Android development: Sora shipped in 28 days using Codex for AI-assisted planning and parallel coding workflows.

Webinar on Codex applications across software development lifecycle.

OpenAI publishes system card for GPT-5.1-CodexMax detailing model and product-level safety mitigations including sandboxing.

OpenAI releases GPT-5.1-Codex-Max, faster agentic coding model for long-running project-scale work with enhanced reasoning.

OpenAI's Codex AI agent is now available in Zed via the Agent Client Protocol (ACP).

OpenAI Codex reaches general availability with Slack integration, SDK, and admin tools.

OpenAI upgrades Codex with faster performance, improved reliability, and real-time collaboration across IDE, terminal, web, and mobile.

OpenAI releases GPT-5-Codex, GPT-5 variant optimized for agentic coding with dynamic compute allocation based on task complexity.

Codex: cloud-based coding agent powered by codex-1 (o3-optimized) trained via RL on real-world software engineering tasks.

OpenAI introduces Codex, a cloud-based coding agent.

Codex is now powering 70 different applications across a variety of use cases through the OpenAI API.

We’ve released new versions of GPT-3 and Codex which can edit or insert content into existing text, rather than just completing existing text.

We’ve created an improved version of OpenAI Codex, our AI system that translates natural language to code, and we are releasing it through our API in private beta starting today.