Thursday, February 12, 2026
This looks really exciting
| | | I've been seeing a lot of demos of the new GPT-5.3 Codex and they've been looking really exciting. | I see Codex definitely heading in a good direction if they keep this up. | Big improvements and brand new features too. | Check out this awesome 3D racing game it made all on its own: | | All it took was a one-shot prompt and a few follow-up prompts to create something this comprehensive. | | Using the develop web game skill and preselected, generic follow-up prompts like "fix the bug" or "improve the game", GPT‑5.3-Codex iterated on the games autonomously over millions of tokens. — OpenAI press release |
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| | And here's a new feature: I can now talk to the Codex as it's responding to me -- without having for it to completely finish. | | Like for those times when I want to add an extra detail to the prompt without having to start over and lose all the progress. | 5 big improvements in GPT-5.3-Codex for software developers | 1. Long-running workflows (new in Codex) | | One of the most important additions is the ability to guide the model while it's working. Instead of waiting for a finished result, developers can interact with GPT-5.3-Codex in real time — asking questions, changing direction, or refining goals mid-task. | The model provides ongoing updates about what it's doing and why, allowing users to: | Adjust approaches as work progresses Clarify intent without restarting tasks Stay involved in decisions while execution continues
| This makes the experience feel more like collaborating with a teammate than issuing commands to a tool. | 2. Stronger real-world coding performance | We've moving just caring about how syntactically correct the code from these AI models are. | GPT-5.3-Codex does better on realistic engineering tasks — the kind that involve messy repositories, incomplete documentation, and multiple moving parts. | SWE-Lancer IC Diamond (advanced engineering tasks)
- GPT-5.3-Codex: 81.4% ✅ - GPT-5.2-Codex: 76.0% - GPT-5.2: 74.6% |
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| So we're talking: | | 3. Faster execution | With this update, we are also now running GPT‑5.3-Codex 25% faster for Codex users, thanks to improvements in our infrastructure and inference stack, resulting in faster interactions and faster results. — OpenAI press release |
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| Speed matters when AI is performing multi-step work. | GPT-5.3-Codex runs noticeably faster in agent-style workflows, which helps reduce the back-and-forth cycle between writing code, testing, and fixing errors. | For us developers, that translates into: | | What 100K+ Engineers Read to Stay Ahead | | Your GitHub stars won't save you if you're behind on tech trends. | That's why over 100K engineers read The Code to spot what's coming next. | Get curated tech news, tools, and insights twice a week Learn about emerging trends you can leverage at work in just 10 mins Become the engineer who always knows what's next
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