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Hello o3, o4 Mini, Codex CLI — OpenAI Just Went Full Power Mode

Meet the new brainiacs in town: ChatGPT o3 and o4 Mini! 
One solves math faster than your calculator, the other’s a coding wizard with fewer tantrums than your IDE. Are they smarter than you? Probably. Should you be worried? Maybe. Let’s find out…

17/04/2025

If you've ever asked ChatGPT to solve a math problem and it gave you an answer with too much confidence (and totally wrong), well — things are about to change. OpenAI just launched two new versions of its AI models: ChatGPT o3 and ChatGPT o4 Mini.

Think of them as the latest upgrade to your favorite chatbot. More clever, more logical, and surprisingly — maybe more affordable too.

Let’s break it down in simple terms. No jargon. Just the cool stuff.

ChatGPT o3 and o4 Mini: What’s New?

🔹 ChatGPT o3

This model is OpenAI’s latest upgrade in the GPT-4 family. It’s sharper in math, logic, reasoning, and code, making it ideal for problem-solving tasks.

Even though it wasn’t supposed to launch as a separate product (more on that below), it’s now available for ChatGPT Plus, Pro, and Team users.

🔹 ChatGPT o4 Mini 

This one is a lighter, faster, and more affordable version. Great for quick answers, simple tasks, and smoother chatbot interactions — perfect for everyday users. Both models support better context handling, and o3 performs better than previous GPT-4 versions in benchmarks.

Bonus: Codex CLI for Developers

OpenAI also released a cool new tool — Codex CLI, a coding assistant that you can run on your local machine.

It lets developers:

  • Plug AI directly into their terminal
  • Work on local projects
  • Use o3 or o4-mini as their coding partner

Think of it like Claude Code (from rival Anthropic), but now inside your system, helping you build faster without copying code to ChatGPT again and again.

So Why Did OpenAI Launch o3 Now?


In February 2025, Sam Altman clearly said o3 wouldn’t be released as a standalone. But then, earlier this month, he changed tune. On X (formerly Twitter), he posted:

“There are a bunch of reasons for this, but the most exciting one is that we are going to be able to make GPT-5 much better than we originally thought.”– Sam Altman on X

He also admitted it was harder than expected to merge everything into one smooth platform. So instead of waiting, OpenAI released o3 now and shifted its energy toward preparing for the massive GPT-5 release, expected in the next few months. In short, it’s like: 

“We wanted to give you a better tool today while we cook up something much bigger tomorrow.”

What’s Coming Next?

  • GPT-5 is officially in the works, and it might launch sooner than we thought.
  • A more advanced version called ChatGPT o3-Pro will roll out exclusively for Pro users soon.
  • Till then, Pro users will continue using o1-Pro as their top-tier model.
ChatGPT o3 and o4 Mini Price? 

No official update on price tags yet, but:

  • o4 Mini is expected to be available to free or low-cost users
  • o3 is part of the ChatGPT Plus and Pro subscriptions (₹1,999/month in India or $20 globally)
These launches are likely OpenAI’s way of offering tiered AI performance to suit every user — casual or professional.

Final Thoughts 

This launch is more than just a model upgrade. It’s a signal. OpenAI is doubling down on performance, speed, and flexibility — while preparing for something even bigger with GPT-5. If you’re a developer, Codex CLI is a must-try. If you’re a regular user, o4 Mini will feel snappy and smart. And if you’re a power user? o3 is where the real magic begins. Get ready — the AI game just got way more interesting.

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