The AI developer that actually does the work.
OpenAI Codex is a cloud-based AI software engineer. It reads your codebase, writes features, fixes bugs, creates tests — asynchronously, while you keep working.
Powered by codex-1 (optimised o3). Native GitHub integration. Isolated sandbox. No copy-paste.
What is OpenAI Codex?
OpenAI Codex is a cloud-based AI software engineer running on codex-1 (optimised o3). It reads your entire codebase, writes features, fixes bugs, creates tests and opens pull requests — asynchronously, without a developer having to supervise every step. Native GitHub integration and an isolated sandbox allow parallel tasks without interference. For Swiss organisations, Codex can be deployed via Azure OpenAI with data residency in Switzerland or the EU.
ChatGPT users worldwide
OpenAI 2025of Fortune 500 use OpenAI
OpenAI 2025faster feature development with Codex
OpenAI 2025developers linked via GitHub Codespaces
GitHub 2025“Codex is not autocomplete — it is an autonomous developer that opens pull requests in the background while your team works on the next feature. That changes how we scale projects.”
Marcel Haas— CEO, CNEXT
Not just code autocomplete.
OpenAI Codex (2025) is not an autocomplete tool like GitHub Copilot. It is a fully autonomous software engineering agent — with its own sandbox environment, real codebase understanding, and the ability to complete multi-step tasks asynchronously.
You delegate a task. Codex clones your repo, analyses the relevant code, implements the solution, runs tests, iterates on failures — and opens a PR for review. All without your involvement.
Every engineering task that costs you time.
Write features
Describe the requirement. Codex reads your codebase, plans the changes, implements them and opens a PR.
Fix bugs
Point Codex at the failing test or stack trace — it finds the root cause, corrects it and writes a regression test.
Write tests
Generates unit, integration and end-to-end tests for existing code. Runs them directly and fixes failures.
Refactor code
Renames variables, extracts components, modernises APIs — across multiple files in one step.
Review code
Analyses PRs for bugs, security gaps, performance issues and style violations with precise improvement suggestions.
Write docs
Generates README files, API docs, inline comments and changelogs directly from source code.
From task to merge — without your involvement.
Hand off the task
You describe the task in natural language — in ChatGPT, via API or directly in the terminal.
Codex analyses your repo
Codex clones your GitHub repo into an isolated sandbox, reads relevant files and plans the changes.
Execution & testing
Writes code, runs tests, iterates on failures — fully autonomously and asynchronously in the background.
PR ready for review
Opens a pull request with full reasoning. You review, comment or merge — you stay in control.
Codex vs. chat-based AI tools.
| Feature | OpenAI Codex | ChatGPT / Copilot / Cursor |
|---|---|---|
| Execution mode | Asynchronous, cloud-based — runs in the background while you keep working | Synchronous in chat — you wait for each response |
| Codebase context | Reads and understands your entire repo — structure, dependencies, tests | Only what you manually paste in |
| Execution | Runs code, tests and build commands in an isolated sandbox | Generates code but does not run it |
| GitHub integration | Native: clones repos, opens PRs, works with branches | Manual copy-paste workflow |
| Parallel tasks | Multiple tasks simultaneously — like a team of developers | One conversation at a time |
We integrate Codex into your team.
From the first repo connection to fully automated dev pipelines.
Codex onboarding & setup
We connect your GitHub repos to Codex, configure permissions, sandbox rules and CI/CD hooks — production-ready in a day.
Team enablement
Workshops on effective task formulation, prompt libraries for your tech stack and internal playbooks.
API integration
Trigger Codex tasks directly from your tools — Jira, Linear, Slack, custom systems — via the OpenAI Responses API.
Enterprise security
Sandbox isolation, secret management, audit logs. Optionally via Azure OpenAI for Swiss data residency.
Multi-agent pipelines
Combine Codex with our OpenClaw agents for fully automated dev-to-deploy pipelines.
Governance & compliance
Code review policies, branch protection rules, FADP/GDPR-compliant configuration for Swiss enterprises.
Codex + OpenClaw + Claude = full agentic pipeline
Combine Codex with our OpenClaw agents and Anthropic Claude for end-to-end automated development and business processes.
Ready to launch your first Codex project?
We connect your repos, train your team and make sure Codex is productive from day one.