ooc, did you try the new /plan mode in codex (both the app and the CLI)?
@reach_vb
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GPT-5.3-Codex achieves State-of-the-Art performance on SWEBench and Terminal Bench
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WE'RE SO UNFATHOMABLY BACK!! > SoTA at SWEBench Pro & Terminal Bench
> GPT-5.3-Codex is much more token efficient at high thinking budget
> It's 25% faster thanks to inference improvements -
Introducing GPT-5.3-Codex: A New Agentic Coding Model
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BOOOOM! Introducing GPT-5.3-Codex: our most capable agentic coding model yet > Frontier coding + terminal skills with fewer tokens
> Built for long-running tasks (research → tool use → execution)
> Interactive mid-turn steering + frequent progress updates
> Stronger default -
Using Codex to Automate PDF to Markdown Conversion
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ICYMI – on PDF, I've recently been having ton of fun w/ a PDF skill I made with Codex – It's quite good at reading PDFs and converting to markdown https://
github.com/openai/skills/
tree/main/skills/.curated/pdf
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Technical approaches to AI model context window optimization
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I do think that better compaction and teaching the models to re-learn context post compaction if they are unsure solves the need for really long context windows to an extent. That said, GPT 5.2 and the codex variants both support 400K context window which is a step up.
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Using AI for automated code review and testing
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/review is great for reviewing code and if you ask codex to create and run tests after each task it’ll just do it
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Codex Introduces New AI-Powered Planning Mode
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most important update after the app – Codex now has a dedicated Plan mode! 🔥
— Vaibhav (VB) Srivastav (@reach_vb) 2 février 2026
It senses what questions to ask and searches for possible answers to them too – works well in both wide as well narrow domain problems
you can try it directly by /plan in the app as well as the CLI https://t.co/5uJ1WXHUv4 pic.twitter.com/dZ0hDzdRx5most important update after the app – Codex now has a dedicated Plan mode! It senses what questions to ask and searches for possible answers to them too – works well in both wide as well narrow domain problems you can try it directly by /plan in the app as well as the CLI
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Using AI agents to enhance data analysis and design workflows
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It's quite insane how a new experience can help you unlock so much more from the same model and harness
— Vaibhav (VB) Srivastav (@reach_vb) 2 février 2026
for instance, I've been using Codex App for data analysis, creating PDFs of that analysis, implement a figma design and more
it's underrated how the overall experience shifts… https://t.co/5uJ1WXHUv4 pic.twitter.com/lz7mOyTWtEIt's quite insane how a new experience can help you unlock so much more from the same model and harness for instance, I've been using Codex App for data analysis, creating PDFs of that analysis, implement a figma design and more it's underrated how the overall experience shifts
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Using AI Agents and Models to Master New Tech Stacks
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my favorite thing to do in these scenarios is to ask codex to look at successful projects using the stack I want to use and help me build skills and agents md accordingly. this helps you emulate best practices quite well!
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Codex AI Model Enables High-Velocity Development in Open Source Projects
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100% yes – infact the OSS repo is probably the biggest public case study for using codex at scale across teams and tech stacks surreal to see it enabling teams deliver at such insane rate with confidence