OpenAI GPT-5-Codex, the new keyboard companion that never sleeps | ChatGPT login | OpenAI Playground | ChatGPT OpenAI | Turtles AI

GPT-5-Codex, the new, optimized version of GPT-5 for agent-based coding in Codex, is now available across CLI, IDE, and cloud environments. It’s more efficient, collaborative, capable of code reviews, and capable of handling complex tasks autonomously.

Key Points:

• Specialized model for GPT-5-Codex agent code: more efficient, more reliable.
• Dynamically adjusts reasoning time based on complexity.
• Automatically reviews pull requests with critical bug detection.
• Seamless integration across terminal, IDE, cloud, GitHub, and mobile apps.

A new player in the world of software engineering is revealed with GPT-5-Codex, representing a step forward in operational coding assistance. Powered by a GPT-5 version finely trained for real-world tasks, Codex now knows how to go from lightning-fast responses to hours-long autonomous sessions, maintaining context and delivering robust code. It doesn’t just write snippets: it starts projects from scratch, adds features, runs automated tests, debugging, large-scale refactoring, and pull request reviews. As complexity increases, the model slows down to think longer, while for simple tasks it runs light and fast. Internally, OpenAI notes that for less demanding requests, GPT-5-Codex uses 93.7% fewer tokens than GPT-5, but for more complex requests, it doubles the time spent reasoning, editing, and testing to achieve a solid implementation. Performance on real-world benchmarks shows growth from about 34% to over 51% in refactoring tasks.

Automated code review is another strong point: it navigates the entire codebase, considers dependencies, runs real tests, and produces targeted comments, reducing unnecessary errors and increasing focus on truly critical issues. The platform is now a unified experience: you can move between the terminal (CLI), IDE (VS Code, Cursor, other forks), web interface, GitHub, and even the iOS app, maintaining context and seamlessly switching between environments.

The Codex CLI has been redesigned for agentive workflows: it supports image attachments, tracks to-do lists, offers simplified approval modes (read-only, automatic, full access), and integrates tools like web search or MCP connections. The IDE extension allows you to directly use the open context in editors and code selections, and create and review cloud tasks from the editor itself. Performance has been optimized in the cloud environment: container caching reduces task completion times by 90%, and you can configure internet access, auto-setup from repository scripts, and attach screenshots generated by the model to tasks or PRs on GitHub.

On the security front, GPT-5-Codex operates in a disconnected sandbox by default (both locally and in the cloud), with explicit approvals before executing potentially risky commands, and configurable network controls. These settings allow for balancing risk and autonomy in different work environments. OpenAI reiterates the importance of human oversight, recommending using Codex as a supplemental reviewer, not a replacement for manual reviews.

The launch comes amid a heated market, with competitors such as Claude Code, Cursor (JetBrains), and other emerging agents. GPT-5-Codex aims to fill the gap and compete effectively on quality, speed, integration, and reliability.

Available immediately for Plus, Pro, Business, Edu, and Enterprise users, GPT-5-Codex is the default template for all cloud and code review features. Local developers can select it via the CLI or IDE extension, while API access is planned soon for those using API keys directly. The pricing structure varies by plan, with additional credit options for Business and Enterprise for more demanding needs.

GPT-5-Codex is therefore the natural evolution of Codex as a digital teammate for modern software engineering, seamlessly integrated into your existing development environment and designed to help you work better. A new era for assisted coding has begun, with you at the center and Codex by your side.