Fredrik Carlsson

Developer. MD. PhD student in medicine at Karolinska Institutet. Main areas of interest are medical foundation models and AI agent use in healthcare.

[Fredrik Carlsson @fizk]

@thsottiaux I'm missing ralph loops! and other long running task harnesses.

[Fredrik Carlsson @fizk]

with that said I have friends publishing 10+ papers before even staring, they are "basically" done before their first day. That could be bit easier with AI, but still more about other things.

[Fredrik Carlsson @fizk]

doubt it. I'm a much more experienced coder than most PhD students. ~80% of what I do is coding. I vibe extensively. What happens is that you just move the goalpost. My projects are much more ambitious than they would have been without Claude Code, Gemini, and ChatGPT.

[Yuchen Jin @Yuchenj_UW]

Tbh, if I had Claude Code, Gemini, and ChatGPT during my PhD, I’d probably have graduated in 1 year instead of 5.5 years.

My PhD was ~50% coding, 25% writing/polishing my papers, 25% reading others' papers. AI now accelerates each by at least 10×. Nothing will ever be the same.

[Fredrik Carlsson @fizk]

@antigravity I just had a case were antigravity using Gemini 3 Pro (high) on its own did git add, git commit and git push and then proceeded to rebuild my project before I stopped it. That was unexpected.

[Fredrik Carlsson @fizk]

I think vibe coding should be mandatory in schools.

[Fredrik Carlsson @fizk]

I love Google’s AI efforts, but for coding I still feel Gemini 3 Pro is behind. It sometimes solves prompts that Chat/Codex 5 fails on, yet makes too many mistakes on “simple” tasks that Opus 4.5 and Chat nails.

[Fredrik Carlsson @fizk]

vibing has definitely grown on me. With the Sonnet era it was useful. But I feel I can be a lot more lose with my prompts since gpt 5. Which is scary since this mean I review and rewrite less code.

[Fredrik Carlsson @fizk]

@ericzakariasson Fab! 😊

[Fredrik Carlsson @fizk]

@maxwellfarrens +1

[Fredrik Carlsson @fizk]

@svpino @VivixLabs_HQ not that I ever used Napster, of course

[Fredrik Carlsson @fizk]

@svpino @VivixLabs_HQ reminds me of the progress I experienced with Napster, at first you had to wait a long time to get at the music and then you could play it, but after broadband, the magical movement when it was possible to download faster than u could consume it

[Fredrik Carlsson @fizk]

Google NotebookLM is also fantastic – especially the quiz mode. I'd be surprised if books on university course reading lists continue to sell as well going forward.

[Fredrik Carlsson @fizk]

The new “Study and Learn” mode in ChatGPT is great!

If textbook authors and publishers felt threatened by copyright violations – they should be even more worried about this.

[Fredrik Carlsson @fizk]

that would be total AI vibe coding – i.e. never looking at the code. But with you acting as the guardrails it's a fantastic productivity boost for a lot of tasks.

[Fredrik Carlsson @fizk]

What has clicked for me so far is AI autocomplete, AI debugging, AI as faster docs, AI as Stack Overflow substitute, AI agents, AI agentic workflow.

What has not clicked: AI vibe coding

AI scaffolding is a bit 50/50.

[Fredrik Carlsson @fizk]

it's been too long, if you ask me. @trueadm

[Ryan Carniato @RyanCarniato]

Again, it's so odd to see React influencers dunk on innovative new projects that have limited reach until they give it to them.

People keep on telling me it is for clicks. But I'm not convinced. It takes guts to come out and say something so questionably ignorant in public.

[Fredrik Carlsson @fizk]

It also feels ridiculous as the day after the GPT-5 launch Opus 4.1 was successful like all the time while GPT-5 was a mess.

[Fredrik Carlsson @fizk]

https://t.co/s6k3iM9CyB

[Fredrik Carlsson @fizk]

It has been a ridiculous day. 4 times Opus was completely baffled in a way that felt off by Claude standards. I pasted the exact same thing to Codex for it to one shot the task. Sure, high reasoning is slow but failing is worse.

[Fredrik Carlsson @fizk]

@natolambert or the original chatgpt 3.5 model?

[Fredrik Carlsson @fizk]

prime motivator to use up all those claude code tokens; have https://t.co/jyKUXEHhhI by
@ryoppippi continuously running