Sebastien Lacan

Technical Founder | Applied AI & Agentic Systems | EPFL Engineer

[Sebastien Lacan @Sebastoken]

I cannot find dots created tasks in the ChatGPT mobile app

[Sebastien Lacan @Sebastoken]

OpenAI should focus on reducing the feature differences between the desktop and mobile apps.

Being able to do almost everything on both would be awesome!

[Sebastien Lacan @Sebastoken]

Trying to understand what ChatGPT’s new cloud environments add. The old work cloud already had access to my repos and apps via plugins. Now there’s more setup, plus domain by domain approvals. I am curious what is the upside I’m missing?

[Sebastien Lacan @Sebastoken]

You know you're a heavy Claude user when you've got 1/7 through 7/7 memorized in % without thinking

it's Friday evening, you're at 65% weekly usage and your brain just whispers "that's just past 4/7"

[Sebastien Lacan @Sebastoken]

@thsottiaux I think it is better without the 5-hour limit, but it is harder to know whether you are using your weekly quota too quickly.

Ideally, I would add a simple usage cursor showing where you should roughly be at that point in the week to stay within the weekly quota

[Sebastien Lacan @Sebastoken]

@francescoswiss This reminds me a video I published a few months ago

https://t.co/kYPii5uQ3Y

[Sebastien Lacan @Sebastoken]

@cryptogoos This reminds me a lot a video I published a few months ago. A mention would have been appreciated: https://t.co/kYPii5uQ3Y

[Sebastien Lacan @Sebastoken]

@MoneyRadar_FR Ça me rappelle beaucoup une vidéo que j’avais publiée il y a quelques mois: https://t.co/kYPii5uQ3Y

[Sebastien Lacan @Sebastoken]

@yasser_elsaid_ What kind of tasks are you running that take several hours?

Most of my AI workflows rarely go beyond 20 to 30 minutes

[Sebastien Lacan @Sebastoken]

@Divs_King Pas de souci
Si ça t’intéresse, je partage d’autre visuels de ce type sur IG/TikTok :
https://t.co/34SI3YUtvJ

[Sebastien Lacan @Sebastoken]

Something I find concerning about AI:

It seems unaware of the value it actually provides.

When I ask about dev time estimates, it still answers as if everything were coded manually.

Even when I point out that AI speeds things up, it doesn’t fully adjust its reasoning.

[Sebastien Lacan @Sebastoken]

@viktoroddy Design

[Sebastien Lacan @Sebastoken]

TL;DR:

If ChatGPT refuses your images, check your format.
On Mac, enabling HDR changes screenshots to HEIC.
Switch back to SDR, or export in JPEG/PNG.

[Sebastien Lacan @Sebastoken]

For 3 weeks, I thought ChatGPT was broken.
Every time I uploaded an image, it went completely off
hallucinating, answering nonsense, missing the point.

I tried everything: browser, VPN, restarts, clearing cache.
Nothing worked.

And the reason?
Was so stupid it actually hurts.

[Sebastien Lacan @Sebastoken]

Guess what?
ChatGPT can’t read HEIC files.

So yeah, I spent three weeks debugging…
because of a file format.

[Sebastien Lacan @Sebastoken]

Spent the whole day creating content.
Feels like I got nothing done, no code, no numbers, no email.

But I know it’s the right path.
Not easy for an engineer’s mind, you’ve got to switch off the logic fuse sometimes.

[Sebastien Lacan @Sebastoken]

You can’t buy back compounding.

At 8% p.a., investing $500/mo until 55:
• Alex starts at 25yo → $745K
• Sam starts at 35yo → $317K
• Chris starts at 45yo → $134K

To match Alex:
• Sam needs $1.2K/mo (×2.4)
• Chris needs $4.2K/mo (×8.4)

Start early. Time beats money.