OpenAI Releases GPT-5.2 Codex, Turning the Coding World Upside Down!

After the arrival of GPT-5.2 last week, everyone was waiting for this moment. Yesterday (December 18), OpenAI officially released “GPT-5.2 Codex”.

Simply put, this isn’t just the “bot that helps write a snippet of code” we’ve seen until now. This is an Agentic AI Model capable of thinking independently, planning, and building a complete project from scratch.

What is the difference in GPT-5.2 Codex?

This is specifically designed for an “Agentic Workflow.” That means:

1. You can simply say, “Build me an E-commerce site.”

2. Codex itself creates the relevant File Structure.

3. It Installs necessary Packages (Terminal Access).

4. It writes the code, runs it, and fixes any errors on its own.

5. Finally, it hands you a fully functional App.

The Battle of AI Agents: Benchmarks Comparison

In the tech world, the SWE-bench (Software Engineering Benchmark) determines who the real heavyweights are. Here is how GPT-5.2 Codex stacks up against other giants:

• GPT-5.2 Codex – 64.2% 🚀

• Devin (Cognition Labs) – 48.5%

• Claude 3.7 Opus – 52.1%

• Gemini 3 Code – 55.8%

Why is this important for a Developer?

• Full Repo Context: Unlike before where it handled just one file, Codex can now understand your entire project at once, even if it has 1000 files.

• Self-Healing Code: If a bug occurs while the code is running, it doesn’t wait to tell you. It debugs and fixes the issue itself.

• Refactoring Master: If you give it old “Spaghetti Code,” it can beautifully transform it into a Clean Architecture.

Final Verdict

Does this mean developers will lose their jobs? No.

However, the saying “A developer who uses AI will replace a developer who doesn’t” is now becoming a reality. Tasks that a Junior Dev would typically do can now be accomplished in seconds with this tool.