Copy and paste this into your codex: “Look through my recent Codex sessions and identify repeated workflows or repeated asks. For anything I keep doing manually, suggest:
1. a skill if it is a reusable workflow
2. a custom subagent if it is a bounded role or investigation task
@reach_vb
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Identifying Workflows for AI Skills and Subagents
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GPT-5 Model Selection and Cost Optimization Strategy
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Unironically, I do think they’d be atleast ~40% cheaper if they used GPT 5.4/ 5.3-Codex w/ Codex harness Lots depend on model, harness, caching and compaction – and how you use it for your use-case Happy to cover the next month in the name of science! 🙂
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Codex: Turning Repeated Prompts into Reusable AI Skills
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Codex Tip: ask Codex to look through your past sessions and turn repeated prompts into reusable skills + subagents you’ll probably find the same stuff showing up again and again: “check why CI failed”
“review this PR”
“write the changelog”
“trace this bug”
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GPT-5.5 Generates 30k Lines QML with Agentic Reasoning
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GPT-5.5 cranking out 30k lines of QML for the Omarchy 4 branch + nailing subtle agentic reasoning!!
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Codex Agent Automates JAX Transformer Coding Challenge
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Couple days back @swyx posted a challenge: code a ~10M transformer in JAX/Flax/Optax, run it in free Colab, and train it on addition w/ your agent! I gave Codex the screenshot + /goal. It controlled Colab through Chrome, used my signed-in session, handled runtime/editing
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Replacing IDE with AI Code Editor Codex App
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realisation: I haven't opened an IDE in more than a month, diff view + file viewer in the codex app is more than sufficient one app to rule them all!
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Codex Publishes Model Training Experiment Blogpost
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codex is writing a blogpost about its experiments in training a model all by itself
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Using AI memory features to personalize code generation and output
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Memories in both ChatGPT and Codex are godsend! It allows them to contextualise and hyper specialise outputs and generations to you and your “taste” I’m often amazed by how Codex would just know tiny details of which tests to run, what commit dynamics it should follow and how to
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Using AI to troubleshoot and fix printer hardware issues
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Codex literally debugged and fixed the printer! The printer wasn't working via the normal PDF to print route, ask codex to iterate and gave it feedback if it worked or not in 3 turns we had fixed the biggest problem of our generation. Scores a resounding 100% on PrinterBench!
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AI coding assistant automates workflows and learns commit patterns
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loads – it's super helpful, it has learnt my commit patterns, testing nuances and surprisingly also what order of things do I ask and automatically run workflows that I'd run over and over!