Codex CLI is also getting better today, with a new codex-mini model optimized for fast code editing! Check out the latest with @hwchung27 @fouadmatin @anupk24
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@romainhuet
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Codex CLI Gets Better with New Codex-Mini Model for Code Editing
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Codex-1 Achieves State-of-the-Art Performance on SWE-Bench Verified
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The codex-1 model is state of the art on SWE-Bench Verified, we published the numbers on the blog. More importantly, we optimized it to generate code that people actually want to merge, not just code that scores well on benchmarks!
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OpenAI Launches Codex: AI Agent for Parallel Software Engineering Tasks
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Coding is about to change forever. We’re launching a research preview of Codex, a cloud-based software engineering agent that can work on many tasks in parallel. Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering.
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Reinforcement Fine-Tuning: o4-mini Learns from Minimal Examples
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Reinforcement fine-tuning still feels magical to me.
— Romain Huet (@romainhuet) 12 mai 2025
Compared to regular fine-tuning, RFT on o4-mini learns from just a handful of solid examples to improve model performance for your use case, even in complex domains. https://t.co/gqyrKW3DqiReinforcement fine-tuning still feels magical to me. Compared to regular fine-tuning, RFT on o4-mini learns from just a handful of solid examples to improve model performance for your use case, even in complex domains.
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Romain offers assistance with o4-mini verification issues
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Sorry you’re running into friction, Stefan! Can you please DM me your org ID (and any ticket #) and I’ll nudge the team to make sure you get the verification sorted. Can’t wait to see what you build with o4-mini!
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Making Agent Creation and Orchestration Easier
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Interesting idea! We’re always trying to make it easier to create or orchestrate agents. What would be most useful to you? cc @dpim
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Upcoming Open Model Release for Developers Planned
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We’re aiming to share a great open model in the coming months. We’d like to make it as useful as possible for developers, feedback welcome!
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OpenAI Plans First Open-Weight Language Model Since GPT-2
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Yes! We recently announced plans to release our first open-weight language model since GPT‑2. We’re gathering input from developers right now and aiming to share a great open model in the coming months. Let us know what you’d like to see:
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Codex CLI: Lightweight Coding Agent for Command Line
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Codex CLI is a lightweight coding agent that runs directly from your command line. It’s been such a joy partnering with @fouadmatin on this. We can’t wait to see what you’ll build with Codex!