Kevin Leneway

Solutions Architect @ OpenAI. Prev Principal Engineer at Pioneer Square Labs, Startup Founder, ex-Microsoft. I also make AI coding videos.

[Kevin Leneway @kleneway]

🏂❄️ Ski Jump Simulator 🏂❄️

This was my first real wow moment with the new Codex app + skills + codex-5.3. I was able to ship a playable, physics-based sim even though I’ve never built a game before!

🧵on tips / lessons learned

https://t.co/9o7ciHADw6

[Kevin Leneway @kleneway]

Powerful new design pattern I’m experimenting with.

MVC: Model, View, Codex

Define the model and build persistent storage, design the front end, encode the business logic + API schema as skills/plugins. Then just chat with Codex + in-app browser. Works surprisingly well!

[Kevin Leneway @kleneway]

Yes, but Codex on Apple Vision Pro is my dream setup

[Julien Chaumond @julien_c]

To this day I still don't understand why there is no ChatGPT or Claude or any other voice app on the Apple Watch, even though it looks like the perfect form factor.

[Kevin Leneway @kleneway]

@jxnlco @dkundel Great read, doing lots of similar things.

I’ve been goal-maxxing lately, one pattern I use: “write x number of lines to a research.jsonl file then deliver a report.md file, keep goal.html updated”

jsonl is easy to count lines, so forces deep research before goal

[Kevin Leneway @kleneway]

@dkundel This is an amazing idea, just tried it and it worked great.

[Riley Brown @rileybrown]

And I’m not talking about point of no return to Claude Code. If they release a model that’s better, great.

I’m talking about using an agent interface (super-app) for ALL tasks.

I don’t go to a browser anymore. I don’t go to email. I don’t go to notion.

Every task that is started is kicked off via an agent chat.

I believe over the next year this is inevitable for all knowledge work.

If your app doesn’t open in the superapp browser you may be…

Cooked.

[Kevin Leneway @kleneway]

@simpsoka @dkundel This was so super helpful, thank you!!!

[OpenRouter @OpenRouter]

The incredibly powerful new GPT Image 2 model from @OpenAI is live on OpenRouter as openai/gpt-5.4-image-2

Using OpenRouter's GPT-5.4 Image 2, you get the image gen capabilities of Image 2 alongside the prompt improvement of GPT-5.4.

[Kevin Leneway @kleneway]

#mmselfie It’s a beautiful day for NCAA basketball! #ArchMadness #ArchesUp

[Kevin Leneway @kleneway]

I've been trying out Shortcut with GPT 5.4 today. It's super impressive, nice job on this!

[nico @nicochristie]

We had early access to GPT 5.4 to benchmark on @tryshortcutai and it is extremely good at Excel

Here is a quick walkthrough of two real-world tasks in our internal eval of 50,000+ cells each

Watch, because the industry is way beyond the same flashy and meaningless DCF demo

[Kevin Leneway @kleneway]

@bfioca Ha I forgot about that one! Definitely lower on the list

[Kevin Leneway @kleneway]

🏂❄️ Ski Jump Simulator 🏂❄️

This was my first real wow moment with the new Codex app + skills + codex-5.3. I was able to ship a playable, physics-based sim even though I’ve never built a game before!

🧵on tips / lessons learned

https://t.co/9o7ciHADw6

[Kevin Leneway @kleneway]

@bfioca That and Summer Games were pretty incredible. Best C64 games by a mile

[Kevin Leneway @kleneway]

p.s. I have to shout-out my inspiration for this game. 1985's classic "Winter Games" for the Commodore 64! So many hours trying to time it juuuust right to hit that red flag!

[Kevin Leneway @kleneway]

But overall, it was very fun to build a full working game end-to-end and Codex is surprisingly good at making games.

Give it a shot! My high score is 112. If you beat it, reply with a screenshot 😄
https://t.co/9o7ciHADw6

[Kevin Leneway @kleneway]

Oh no way it worked lol. Shoutout to ClawVault for the "primitives" idea. It even one-shotted out a swift app for the menubar, and just for fun I made a Remotion video of the readme! 😂

https://t.co/EUNm3wvzPV

[Kevin Leneway @kleneway]

Weekend project - cron job to screenshot my laptop every five seconds, then use a codex automation to take notes and eventually create skills for my repetitive tasks.