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Common Lisp Screenshots: today's CL applications in action(lisp-screenshots.org)
87 points by _emacsomancer_ 2 days ago | 24 comments
_emacsomancer_ 2 days ago | parent | next [-]

(including HN! - https://media.simple.photo/12M3xnh3VhDMUgCs8DVhkTBI6OgDGGIX/... )

psychoslave 2 hours ago | parent | next [-]

Too bad the screenshot doesn't show this page as a nice autoreference mise en abîme.

veqq 7 hours ago | parent | prev [-]

Indeed, Arc's been running on Common Lisp for a while now!

testermelon 6 hours ago | parent | prev | next [-]

I like how the disclaimer went humble bragging about the range of usage.

Fr0styMatt88 6 hours ago | parent | prev | next [-]

While not Common Lisp I've always found it pretty cool that AutoCAD shipped with a Lisp, making the language technically a hugely deployed commercial success.

bitwize 4 hours ago | parent [-]

Were it not for early exposure to Autolisp I would not have appreciated Lisp or Lisp-based systems, like Emacs, the way that I did. I might've ended up whinging that they didn't use a mOdErN language like JavaScript.

Autolisp definitely sent me down the left-paren path.

tmtvl 20 hours ago | parent | prev | next [-]

Until Vindarel gets the TLS working there's also a direct URL: (<https://simple.photo/vindarel/c352e2c0177b24786fb40041657485...>). It's a bit of a shame that there's no indication to what application each screenshot is from.

coryrc 3 hours ago | parent [-]

Many of them do say which program they are from; at least the first of multiple are from the same program.

bitwize 4 hours ago | parent | prev [-]

Lisp is aesthetics now. I used to appreciate the way in which its constructs gave the ordinary programmer considerably more reach. It made programming fun, the way I could talk directly to a running system and extend its functionality outwards with a minimum of boilerplate, procedures and data chasing each other's tails in a kind of neverending ouroboros.

But the fact is, whatever productivity gains I may have gained in Lisp are absolutely dwarfed by those gained by using an LLM. I have literally seen LLMs pointed at a problem, solve it almost instantly. And LLMs do better the more popular the programming language you're working in. So what's the point of choosing Lisp? Oh, your feeble human brain can understand the problem and craft a solution much more quickly and in a flow state without being bogged down by tedium? That's nice. Claude Code can understand the problem and craft a solution without you even being in the room. It's a cheat code. It's iddqd. It's "pay to win" for what used to be the challenging, demanding, and fun game of programming.

And Lisp went from being "still kinda the best programming language ever" to a retrocomputing curiosity almost overnight. There is no practical reason to start a new project in Lisp in 2026.

b00ty4breakfast an hour ago | parent | next [-]

The unfettered instrumental rationality of the techno-slob on full display. Bonus depravity-points if the multi-paragraph HN comments are also being outsourced to the Machine.

WolfeReader 2 hours ago | parent | prev | next [-]

We have enough headlines about LLMs already. Let's just enjoy a cool Lisp site without some AI advocate telling us that non-AI things are irrelevant.

ChanderG 2 hours ago | parent | prev | next [-]

Depending on a corporation to do your programming (and burning half the planet in the process, pardon the hyperbole) is the very opposite end of the "hacker" ethos where Lisp stands. Very surprising to see this sort of comment on HN, of all places.

rootnod3 2 hours ago | parent [-]

Really? Feels like most Of HN lately is just “get on the AI hype train or get downvoted”

stackghost 12 minutes ago | parent [-]

HN has never really walked the walk when it came to embodiment of the hacker spirit.

Before the incessant AI hype it was crypto, and before that it was JavaScript frameworks and before that it was ...

silcoon an hour ago | parent | prev | next [-]

Kind of yes and kind of no. Not many reasons to use Common Lisp I agree, but the Lisp idea itself has still something to offer that couldn’t be found in other systems.

I’m comfortable to declare that are not macros the most powerful thing of Lisp, but the concept of an environment. Still in 2026 many languages now implement the concept of evaluating the code and make it immediately available but nothing is like Lisp.

Lower level programming languages today they all still requires compilation. Lisp is one of the few that I found having the possibility to eval code and its immediately usable and probably the only that really relies heavily on REPL driven development.

Env+REPL imo is the true power still far ahead of other languages. I can explore the memory of my program while my program is running, change the code and see the changes in real time.

The issue is that CL is old, and Clojure is so close to be perfect if it wasn’t for Java. Clojure replaces Java, not CL and this is its strength but also its weakness.

rootnod3 3 hours ago | parent | prev | next [-]

Can your LLM do that to a running system? Or will it have to restart the whole program to run the next iteration? Imagine you build something with long load-times.

Also, your Lisp will always behave exactly as you intended and hallucinate its way to weird destinations.

whartung 2 hours ago | parent | next [-]

I can’t speak to getting an LLM to talk to a CL listener, simply because I don’t know the mechanics of hooking it up. But being as they can talk to most anything else, I see no reason why it can’t.

What they can certainly do is iterate with a listener with you acting as a crude cut and paste proxy. It will happily give you forms to shove into a REPL and process the results of them. I’ve done it, in CL. I’ve seen it work. It made some very interesting requests.

I’ve seen the LLM iterate, for example, with source code by running it, adding logging, running it again, processing the new log messages, and cycling through that, unassisted, until it found its own “aha” and fixed a problem.

What difference does it make whether it’s talking to a shell or a CL listener? It’s not like it cares. Again, the mechanics of hooking up an LLM to a listener directly, I don’t know. I haven’t dabbled enough in that space to matter. But that’s a me problem, not an LLM problem.

bitwize an hour ago | parent | prev [-]

An LLM can modify the code, rebuild and restart the next iteration, bring it up to a known state and run tests against that state before you've even finished typing in the code. It can do this over and over while you sleep. With the proper agentic loop it can even indeed inject code into a running application, test it, and unload it before injecting the next iteration. But there will be much less of a need for that kind of workflow. LLMs will probably just run in loops, standing up entire containers or Kubernetes pods with the latest changes, testing them, and tearing them down again to make room for the next iteration.

As for hallucinations, I believe those are like version 0 of the thing we call lateral thinking and creativity when humans manifest it. Hallucinations can be controlled and corrected for. And again—you really need to spend some time with the paid version of a frontier model because it is fundamentally different from what you've been conditioned to expect from generative AI. It is now analyzing and reasoning about code and coming back with good solutions to the problems you pose it.

lgrapenthin 3 hours ago | parent | prev [-]

You are comparing a PL to a text generator. What are you on?

dang 3 hours ago | parent | next [-]

Hey, please don't cross into personal attack - you can make your substantive points without that, and we'll all be better for it.

https://news.ycombinator.com/newsguidelines.html

akagr 2 hours ago | parent | prev | next [-]

I believe (correct me if I’m wrong), their point is that with time, we’re writing less code ourselves and more through LLMs. This can make people disconnected from the “joy” of using certain programming languages over others. I’ve only used cl for toy projects and use elisp to configure my editor. As models get better (they’re already very good), the cost of trashing code spirals downwards. The nuances of one language being aesthetically better than other will matter less over time.

FWIW, I also think performant languages like rust will gain way more prominence. Their main downside is that they’re more “involved” to write. But they’re fast and have good type systems. If humans aren’t writing code directly anymore, would a language being simpler or cleverer to read and write ultimately matter? Why would you ask a model to write your project in python, for instance? If only a model will ever interact with code, choice of language will be purely functional. I know we’re not fully there yet but latest models like opus 4.6 are extremely good at reasoning and often one-shotting solutions.

Going back to lower level languages isn’t completely out of the picture, but models have to get way better and require way less intervention for that to happen.

bitwize 3 hours ago | parent | prev [-]

No, I'm not.

I used to appreciate Lisp for the enhanced effectiveness it granted to the unaided human programmer. It used to be one of the main reasons I used the language.

But a programmer+LLM is going to be far more effective in any language than an unaided programmer is in Lisp—and a programmer+LLM is going to be more effective in a popular language with a large training set, such as Java, TypeScript, Kotlin, or Rust, than in Lisp. So in a world with LLMs, the main practical reason to choose Lisp disappears.

And no, LLMs are doing more than just generating text, spewing nonsense into the void. They are solving problems. Try spending some time with Claude Opus 4.6 or ChatGPT 5.3. Give it a real problem to chew on. Watch it explain what's going on and spit out the answer.

lgrapenthin an hour ago | parent | next [-]

My hammer is also solving problems. Still, hammering is not programming. LLMs are text generators.

rootnod3 2 hours ago | parent | prev [-]

Until there is a bug and say due to DNS issues your LLM is. It reachable because everything is down