OpenAI Releases o3, o4-mini & Codex CLI: A New Era in AI Reasoning & Development

 


OpenAI Releases o3, o4-mini & Codex CLI: A New Era in AI Reasoning & Development

In a major leap toward the future of Artificial General Intelligence (AGI), OpenAI has launched its most advanced models yet — o3 and o4-mini — alongside a revolutionary open-source coding agent, Codex CLI. These state-of-the-art models push the boundaries of what’s possible in AI-powered reasoning, coding, and visual analysis.

Explore the full release here

What’s New with o3 and o4-mini?

OpenAI’s o3 model is now its top-tier reasoning model, built to deliver exceptional performance in areas like coding, math, science, and multimodal tasks. Meanwhile, o4-mini provides blazing-fast reasoning at a lower cost, while still outperforming many older models — even achieving high scores on benchmarks like AIME 2025 math.

Key Features:

  • Tool Integration: Both models can fully use tools within ChatGPT — including web search, Python, image generation, and more.
  • Visual Thinking: These are the first models that can truly “think with images,” processing and reasoning through visual data as part of their workflows.
  • Chain of Thought Multimodality: The integration of visuals into text-based reasoning allows for more accurate answers, creativity, and deeper understanding.

Read more on OpenAI’s breakthrough

Codex CLI: Open-Source Coding Companion

Another exciting part of the announcement is Codex CLI, a powerful open-source coding agent designed to work directly in developer terminals. It acts as a bridge between reasoning models and real-world coding tasks, providing a smart assistant experience in command-line environments.

Launch Codex CLI and explore features

OpenAI’s Vision: Closer to AGI?

Greg Brockman, President of OpenAI, described this release as a "GPT-4 level qualitative step into the future." The ability of these models to create novel scientific ideas, synthesize multimodal data, and execute complex reasoning with tool access brings us ever closer to Step 4 in OpenAI’s roadmap toward AGI.

Read about OpenAI's roadmap and Step 4

Augment Agent: Built for Professional Developers

Also making waves is Augment Code’s new AI coding agent, which delivers world-class performance for professional developers. This agent blends the power of Claude 3.7 and OpenAI’s o1, topping SWE-Bench rankings.

Highlights:

  • Works inside Vim, JetBrains, and VS Code
  • Supports over 100+ native & MCP tools
  • Speeds up real-world development tasks with smart, context-aware coding support

Sign up and try Augment Agent here

Final Thoughts

With o3, o4-mini, Codex CLI, and the Augment Agent, OpenAI and its collaborators are paving the way for smarter AI agents, more productive developers, and perhaps even true AGI.

The future of software development and artificial intelligence is not just near — it’s already unfolding.


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