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Bun is joining Anthropic

https://bun.com/blog/bun-joins-anthropic
263•ryanvogel•41m ago

Comments

ChrisArchitect•31m ago
Associated Anthropic post: https://www.anthropic.com/news/anthropic-acquires-bun-as-cla...
colesantiago•30m ago
Is Claude Code the first CLI tool to have a $1BN ARR?
CSSer•24m ago
I don't know for sure, but it's definitely the first tool of that value to have a persistent strobing (scroll position) bug so bad that passersby ask me if I'm okay when they see it.
jedixit•20m ago
This graph from the SemiAnalysis blog suggests that GitHub Copilot reached it earlier this year: https://substackcdn.com/image/fetch/$s_!BGEe!,f_auto,q_auto:...
simonw•18m ago
"GitHub Copilot" encompasses so many different products now that it's hard to see it as a CLI tool.
altmanaltman•8m ago
It doesn't make a lot of sense that they'll compare Microsoft 365 Copilot with Claude Code, though? Like it is a legit CLI tool but we should ignore it because it shares the name with something else?
theflyinghorse•30m ago
Congratulations to the bun team!
victorbuilds•28m ago
I use Claude Code CLI daily - it's genuinely changed how I work. The $1B number sounds crazy but honestly tracks with how good the tool is. Curious how Bun integration will show up in practice beyond the native installer.
slig•26m ago
Love bun! Congratulations!
re-thc•25m ago
Congrats...

> Long-term stability. a home and resources so people can safely bet their stack on Bun.

Isn't it the opposite? Now we've tied Bun to "AI" and if the AI bubble or hype or whatever bursts or dies down it'd impact Bun.

> We had over 4 years of runway to figure out monetization. We didn't have to join Anthropic.

There's honestly a higher chance of Bun sticking out that runway than the current AI hype still being around.

Nothing against Anthropic but with the circular financing, all the debt, OpenAI's spending and over-valuations "AI" is the riskier bet than Bun and hosting.

ricopags•22m ago
I say don't muddy the water with the public panic over "will it won't it" bubble burst predictions.

The effective demand for Opus 4.5 is bottomless; the models will only get better.

People will always want a code model as good as we have now, let alone better.

Bun securing default status in the best coding model is a win-win-win

re-thc•15m ago
> I say don't muddy the water with the public panic over "will it won't it" bubble burst predictions.

It does matter. The public ultimately determines how much they get in funding if at all.

> The effective demand for Opus 4.5 is bottomless; the models will only get better.

The demand for the Internet is bottomless. Doesn't mean Dotcom didn't crash.

There are lots of scenarios this can play out, e.g. Anthropic fails to raise a certain round because money dried up. OpenAI buys Anthropic but decides they don't need Bun and closes out the project.

phantasmish•22m ago
Yeah, no reader of tech news will take an acquisition of a company with four years of runway as anything but decreasing the odds their product will still be around (and useful to the same audience…) in four years. Even without being tied to a company with lots of exposure to a probable bubble.
supern0va•16m ago
How so? Presumably Jarred got a nice enough payout that if Anthropic failed, he would not need to work. At that point, he's more than welcome to take the fully MIT licensed Bun and fork it to start another company or just continue to work on it himself if he so chooses.
phantasmish•10m ago
History?

I didn’t say it was definitely the end or definitely would end up worse, just that someone who’s followed tech news for a while is unlikely to take this as increasing the odds Bun survives mid-term. If the company was in trouble anyway, sure, maybe, but not if they still had fourish years in the bank.

“Acquired product thriving four years later” isn’t unheard of, but it’s not what you expect. The norm is the product’s dead or stagnant and dying by then.

Lermatroid•21m ago
Yeah that’s the main part that puzzled me, super happy for the team that they got a successful exit, but I wouldn’t really consider Anthropic’s situation to be stable…
jedahan•25m ago
:(
qsort•25m ago
Anthropic? The AI people?
jsheard•23m ago
Look, if a terminal emulator can raise $67 million by riding the AI hypewave then a Javscript runtime can do the same. Nobody said that AI funding and acquisitions have to make any sense.
jackblemming•24m ago
The Bun team works hard, glad to see it pay off.
tkel•23m ago
Oh no ... unfortunately this likely means a Bun.AI API in my JS runtime.
afavour•23m ago
What matters: it's staying open source and MIT licensed. I sincerely hope it stays that way. Congrats to the Bun team on making a great tool and getting the recognition they deserve.

> Being part of Anthropic gives Bun: Long-term stability.

Let's see. I don't want to always be the downer but the AI industry is in a state of rapid flux with some very strong economic headwinds. I wouldn't confidently say that hitching your wagon to AI gives you long term stability. But as long as the rest of us keep the ability to fork an open source project I won't complain too much.

(for those who are disappointed: this is why you stick with Node. Deno and Bun are both VC funded projects, there's only one way that goes. The only question is timeline)

cortesoft•21m ago
Nothing gives you long term stability in tech. You have to constantly work at staying stable, and it isn't always up to anything the company is in control of, no matter what ownership they have.
afavour•17m ago
> Nothing gives you long term stability in tech.

Sure. But everything is relative. For instance, Node has much more likelihood of long term stability than Bun, given its ownership.

pelagicAustral•22m ago
Godspeed. Seems like a good pairing. Bun is sort of the only part of the JS ecosystem I like, and Code has become such an important tool for my work, that I think good things will come out of this match. Go Bundler as well.
wiseowise•22m ago
Hope nobody buys Astral or Python is f*cked.
zelphirkalt•19m ago
Then it would probably be back to Poetry. Or some other newcomer, or maybe a fork of uv.
andrewl-hn•15m ago
Honestly, given the constant rollercoaster of version management and building tools for Python the move to something else would be expected rather than surprising.

I’ve seems like a great tool, but I remember thinking the same about piping, too.

baq•8m ago
If you froze uv today it’ll take years for anything to get to a state where the switch would be worth it.
whalesalad•17m ago
Our entire business runs on Python without a drop of Astral in the mix. No one would even notice.
mrcwinn•22m ago
Congrats. This is the first time I remember reading a genuine, authentic story about a sale. Much preferred over “this is about continuing the mission until my earn-out is complete.”
jjordan•22m ago
I don't really see how Bun fits as an acquisition for an AI company. This seems more like "we have tons of capital and we want to buy something great" than "Bun is essential to our core business model".
nurumaik•21m ago
Looks like they are acquiring the team rather than the product
simonw•20m ago
No, they're clearly acquiring the technology. They're betting Claude Code on Bun, they have an invested interest in the health of Bun.
LunaSea•17m ago
Why would they want to bet on nascent technology whereas Node.js bas existed for a god 15 years?
stonogo•14m ago
Because Microsoft already owns that.
Octoth0rpe•7m ago
Are you referring to node? MS doesn't own that. It's maintained by Joyent, who in turn is owned by Samsung.
giancarlostoro•16m ago
That was my thinking is, this would be useful for Claude Code.
gkoberger•19m ago
If Anthropic wants to own code development in the future, owning the full platform (including the runtime) makes sense.

Programming languages all are a balance between performance/etc and making it easy for a human to interact with. This balance is going to shit as AI writes more code (and I assume Anthropic wants a future where humans might not even see the code, but rather an abstraction of it... after all, all code we look at is an abstraction on some level).

singularity2001•16m ago

   "the full platform"
there are more languages than ts though?

Acquisition of Apple Swift division incoming?

tomashubelbauer•13m ago
TypeScript is the most popular programming language on the most popular software hosting platform though, owning the best runtime for that seems like it would fit Pareto's rule well enough:

https://github.blog/news-insights/octoverse/octoverse-a-new-...

bigyabai•9m ago
Why acquire Swift when you can write iOS apps in Typescript instead?
giancarlostoro•8m ago
Which would use something like Bun ;)
giancarlostoro•9m ago
According to a JetBrains dev survey (I forget the year) roughly 58% of devs deploy to the web. That's a big money pie right there.
vlovich123•5m ago
Bun isn’t on the web. It’s a server runtime.
giancarlostoro•4m ago
It's a JS runtime, not specifically servers though?
Kwpolska•5m ago
They will own it, and then what? Will Claude Code end every response with "by the way, did you know that you can switch to bun for 21.37x faster builds?"
hobofan•4m ago
Even outside of code development, Anthropic seems to be very strongly leaning into code interpreter over native tool calling for advancing agentic LLM abilities (e.g. their "skills" approach). Given that those necessitate a runtime of sorts, owning/having access to a runtime like Bun that could e.g. allow them to very seamlessly integrate that functionality into their products better, this acquisition doesn't seem like the worst idea.
sankalpmukim•19m ago
Does this acquisition mean Claude Code the CLI is more valuable than entiriety of Bun?
gehsty•16m ago
It certainly generated more revenue, so this is not surprising?
re-thc•12m ago
> It certainly generated more revenue, so this is not surprising?

Anything is greater than 0

rvz•14m ago
It does actually.

Claude Code is a 1B+ cash machine and Anthropic directly uses Bun for it.

Acquiring Bun lowers the risk of the software being unmaintained as Bun made $0 and relied on VC money.

Makes sense, but this is just another day in San Francisco of a $0 revenue startup being bought out.

myth_drannon•22m ago
First major success story for Zig language? (Not trying to diminish Bun's team success)
Uninen•10m ago
I'd say Ghostty is a pretty big success story as well.
Cieric•3m ago
Let's not forget about TigerBeetle either. They weren't bought (as far as I'm aware), but they seem to have some pretty good backing from customers.
smileson2•21m ago
Makes sense, I had idea how else the investors would have made money on a javascript bundler/jsc frontend
ymsodev•21m ago
This somewhat answers the question of "how on earth is a JS runtime company going to profit?"
iyn•21m ago
Curious about the deal value/price — any clues whether it was just to make existing investors even (so say up to $30M) or are we talking some multiple? But if it's a multiple, even 2x sounds a bit crazy.
moralestapia•21m ago
What?

Why?

tibbydudeza•21m ago
Reminds me of Atlassian buying an AI browser.
heinekan•21m ago
I’m curious to what the acquisition price was. Bun said they’ve raised $26 million so I’m assuming the price tag has to be a lot higher than that for investors to agree to an acquisition.
yanis_t•21m ago
I don't get it. Why would Anthropic need to own a JS runtime?
simonw•19m ago
Because they have a product that makes $1bn+ a year that depends on having a good, stable, cross-platform JS runtime.
LunaSea•17m ago
You're describing Node.js which has existed for the last 15 years
dboreham•4m ago
And is owned by Microsoft. The theory is that by symmetry Anthropic should own a node competitor.
krashidov•15m ago
I'm still confused. Why not just pour a ton of resources into it since it's open source. I guess dev mindshare? It is a great product
sneak•14m ago
That doesn’t require or benefit from acquiring Bun. Node continues to exist and serve fine.
altmanaltman•11m ago
but they are a company that burns billions every year in losses and this seems like a pretty random acquisition.

Bun is the product that depends on providing that good, stable, cross-platform JS runtime and they were already doing a good job. Why would Anthropic's acquisition of them make them better at what they were already doing?

baq•5m ago
Why would Sun then Oracle own Java? Why would Microsoft own .net? Why would Apple own swift?

IOW look where the puck is going.

fprotthetarball•4m ago
I'm wondering if Bun would be a good embedded runtime for Claude to think in. If it does sandboxing, or if they can add sandboxing, then they can standardize on a language and runtime for Claude Code and Claude Desktop and bake it into training like they do with other agentic things like tool calls.
Tiberium•20m ago
As someone who have been using Deno for the last few years, is there anything that Bun does better? Bun seems to use a different runtime (JSC) which is less tested than V8, which makes me assume it might perform worse in real-world tasks (maybe not anymore?). The last time I checked Bun's source code, it was... quite messy and spaghetti-like, plus Zig doesn't really offer many safety features, so it's not that hard to write incorrect code. Zig does force some safety with ReleaseSafe IIRC, but it's still not the same as even modern C++, let alone Rust.

I'll admit I'm somewhat biased against Bun, but I'm honestly interested in knowing why people prefer Bun over Deno.

ecares•19m ago
It has wayyyyy better nodejs compatibility (day 1 goal)
Tiberium•17m ago
As far as I know, modern Node compat in Deno is also quite great - I just import packages via 'npm:package' and they work, even install scripts work. Although I remember that in the past Deno's Node compat was worse, yes.
TheFlyingFish•11m ago
I haven't used Deno, but I do use Bun purely as a replacement for npm. It does the hard-linking thing that seems to be increasingly common for package managers these days (i.e. it populates your local node_modules with a bunch of hard links to its systemwide cache), which makes it vastly quicker and more disk-efficient than npm for most usage.

Even with a cold cache, `bun install` with a large-ish dependency graph is significantly faster than `npm install` in my experience.

I don't know if Deno does that, but some googling for "deno install performance vs npm install" doesn't turn up much, so I suspect not?

As a runtime, though, I have no opinion. I did test it against Node, but for my use case (build tooling for web projects) it didn't make a noticeable difference, so I decided to stick with Node.

cesarvarela•3m ago
I've found it to be at least twice as fast with practically no compat issues.
FragenAntworten•3m ago
Easily bundling and serving frontend code from your backend code is very appealing: https://bun.com/docs/bundler/fullstack

Despite the page title being "Fullstack dev server", it's also useful in production (Ctrl-F "Production Mode").

kylecarbs•20m ago
Bun has completely changed my outlook on the JS ecosystem. Prior to Bun, there was little focus on performance. Now the entire space rallies around it.

Congrats to Jarred and the team!

nailer•14m ago
One important original point of node was that v8 made JS very fast by compiling to machine code, plus it’s had multithreading built in for a decade.
renewiltord•19m ago
Hahaha congratulations. This is amazing. The most unlikely outcome for a devtools team. Fascinating stuff.

This is promising for Astral et al who I really like but worried about their sustainability. It does point to being as close to the user as possible mattering.

andrewl-hn•18m ago
I’ll be honest, while I have my doubts about the match of interests and cohesion between an AI company and a JS runtime company I have to say this is the single best acquisition announcement blog post I’ve seen in 20 years or so.

Very direct, very plain and detailed. They cover all the bases about the why, the how, and what to expect. I really appreciate it.

Best of luck to the team and hopefully the new home will support them well.

raw_anon_1111•5m ago
But how is another company that is also VC backed and losing money providing stability for Bun?

How long before we hear about “Our Amazing Journey”?

On the other hand, I would rather see someone like Bun have a successful exit where the founders seem to have started out with a passion project, got funding, built something out they were excited about and then exit than yet another AI company by non technical founders who were built with the sole purpose of getting funding and then exit.

ctoth•17m ago
This decision is honestly very confusing to me as a constant user of Claude Code (I have 3 of them open at the moment.)

So many of the issues with it seem to be because ... they wrote the damn thing in JavaScript?

Claude is pretty good at a constrained task with tests -- couldn't you just port it to a different language? With Claude?

And then just ... the huge claude.json which gets written on every message, like ... SQLite exists! Please, please use it! The scrollback! The Keyboard handling! Just write a simple Rust or Go or whatever CLI app with an actual database and reasonable TUI toolkit? Why double down and buy a whole JavaScript runtime?

asim•16m ago
It's more honest than the Replicate answer but I think inevitably if you can't raise the next round and you get distracted by the shiny AI that this is the path taken by many teams. There is absolutely nothing wrong with that. There was an exuberant time when all the OSS things were getting funded, and now all AI things get funded. For many engineer founders, it's a better fit to go build deep technical stuff inside a bigger company. If I had that chance I would probably have taken it too. Good luck to the Bun team!
copperroof•16m ago
Well this just created a lot of work for me. Everything’s turning to shit at an alarming rate.
kace91•15m ago
>If most new code is going to be written, tested, and deployed by AI agents

That perspective following “in two-three years” makes me shudder, honestly.

mritchie712•13m ago
> At the time of writing, Bun's monthly downloads grew 25% last month (October, 2025), passing 7.2 million monthly downloads. We had over 4 years of runway to figure out monetization. We didn't have to join Anthropic.

I believe this completely. They didn't have to join, which means they got a solid valuation.

> Instead of putting our users & community through "Bun, the VC-backed startups tries to figure out monetization" – thanks to Anthropic, we can skip that chapter entirely and focus on building the best JavaScript tooling.

I believe this a bit less. It'll be nice to not have some weird monetization shoved into bun, but their focus will likely shift a bit.

drakythe•10m ago
Given the worries about LLM focused companies reaching profitability I have concerns that Bun's runway will be hijacked... I'd hate for them to go down with the ship when the bubble pops.
a-dub•11m ago
they acquihired the team and derisked their investment in building claude code on top of bun. makes sense to me.

moreover, now they can make investments in order to make it an an even more efficient and secure runtime for model workspaces.

ptak•11m ago
What a trip. Love both, so all good I guess.
mhitza•10m ago
This acquisition makes no sense.

Investors must be happy because Bun never had to find out how to become profitable.

baq•7m ago
It’s enough Anthropic finds it profitable to run Claude Code on it.
dboreham•5m ago
> This acquisition makes no sense.

except this sense:

> Investors must be happy because Bun never had to find out how to become profitable.

zwnow•9m ago
Well not gonna use Bun anymore I guess
jjice•6m ago
Why not?
suralind•8m ago
Good luck, always worried about stuff like that because it happened so many times and the product got worse eventually. At the same time, ai understand how much effort went into building something like Bun and people need to fund their life's somehow, so there's that.
beanjuiceII•8m ago
anthropic wont win, and will just get bought out by an ibm or oracle in the end...time to migrate from bun now
focusgroup0•7m ago
Congratulations to Jared. He and the team are Real Ziggers. Looking forward to a faster Claude Code!
polskibus•6m ago
Wouldn’t it make more sense to write the same functionality using a more performant, no-gc language? Aren’t competitors praised for their CLIs being faster for that reason?
ximeng•3m ago
I use bun in a project but Claude Code always uses node to run throwaway scripts. Maybe they can persuade it to use bun as part of this acquisition?

Bun is joining Anthropic

https://bun.com/blog/bun-joins-anthropic
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