Hy4 preview (tencent.com)

235 points by shenli3514 10 hours ago

simonw 7 hours ago

> [...] Let's maybe add a helmet? It could improve riding theme, but may obscure head. Maybe a small cycling cap or helmet? The user didn't ask; can add red helmet? Might be cute. But pelican with big beak; a helmet might obscure. Better maybe no.

> Maybe add sunglasses? no.

> Maybe add water? no.

https://tools.simonwillison.net/markdown-svg-renderer#url=ht...

demibabs 5 hours ago

No one’s talking about how good the final product is.

Edit: someone else commented that as I was typing this, lol.

gs17 5 hours ago

> Let's maybe add comments? The final code can have comments. Fine.

tyre 5 hours ago

This is actually pretty good!

kurante 6 hours ago

Is the broken English an optimization or a byproduct of the model being developed in China?

acheong08 6 hours ago

When GPT-5.6-sol's reasoning traces were leaked, they also used "caveman speak". Definitely a token efficiency optimization

beefsack 6 hours ago

minimaxir 6 hours ago

Optimization. Why use many word when few word do trick?

andsoitis 6 hours ago

stavros 6 hours ago

gaigalas 4 hours ago

walrus01 5 hours ago

qwen3.8-flash-next also 'thinks' like this in its thinking stage before output, watching it 'think' in opencode, but it produces syntax correct and grammatically correct code comments, changelogs and readme type files.

ekianjo 6 hours ago

Saving tokens

andsoitis 5 hours ago

AdamConwayIE 3 hours ago

Likely something that was first made especially obvious by Chinese models and then became something worth optimizing for in English too.

Chinese can be extremely information-dense in token terms, though it depends on the tokenizer. Roughly speaking, you can pack more "meaning" into a short sequence than English often allows for. That's why "caveman" reasoning is a pretty good fit.

There's a difference between bolting caveman speak onto an existing model and training a model to reason that way, though. If you just force an existing model to be concise in outputs, you're artificially reducing its available reasoning steps and can possibly prevent useful exploration or verification. If it's trained specifically to use compressed reasoning, it can learn to represent the same intermediate ideas in fewer generated tokens, cutting the number of sequential inference steps without necessarily sacrificing the useful reasoning itself.

It's not so much inherently a Chinese-model trait, but Chinese models could definitely have helped demonstrate how effective very compressed reasoning traces can be.

There are few tests of this, but one example I thought was interesting was here: https://github.com/PastaPastaPasta/llm-chinese-english

I wouldn't say it was Chinese specifically that was emulated, but it got people thinking about tokenizers and representation efficiency, and how natural English is rather inefficient.

delichon 4 hours ago

If someone can look at that reasoning trace and see a stochastic parrot next word prediction machine, we don't understand those words in the same way.

0xfaded 2 hours ago

I still call them stochastic parrots, but believe what they are revealing is that we are all stochastic parrots to some extent. I simply don't see how biological computation (i.e. thinking) can be anything else. Similar to the reveal in west world, we are likely much simpler than we give ourselves credit for.

A "train of thought" can be seen as a trace of a depth first search where the preceding trace is used to guide termination and next expansion decisions. A similar concept, "taboo search", exists in classical constraint optimization where previous solutions are fit to a model that guides future expansion (but as the name "taboo" implies, away from uninteresting solutions).

We also have harnesses that perform breath first search.

If I tried to describe what it means to "think deeply", I would probably say a combination of both.

Ultimately I believe that we will surpass human capabilities but fail with alignment. Handing the world's resources over to stochastic systems that can evolve faster than we can reason about them simply leaves too many "interesting" outcomes that do not end well. I also expect the failure modes will be totally non-obvious.

pasteleft 19 minutes ago

LLM is "stochastic parrot next word prediction machine"; it's just that this "stochastic parrot next word prediction machine" have proven to be smarter than most people. I mean, this already happened with AlphaGo too.

sneak 4 hours ago

Yeah, it has been clear for a long time that there is reasoning and mental modeling going on here.

The other option is that you do understand those words the same way, and the people making these (now nonsensical) anti-AI claims simply aren’t talking about the same programs/models we are. Their idea of SOTA is when chatgpt.com launched.

If you took a point sample pre-Opus, and didn’t write a good prompt, of course you would think all AI programming was worthless slop.

dnautics 3 hours ago

The stochastic parrot epithet is so 4 months ago

codethief 7 hours ago

> Notably, Hy4 preview also contributed to its own development process, participating for the first time in the automated optimization of training methods, data strategies, evaluation frameworks, and low-level operators. The model proposed approaches, ran experiments, and iterated based on the results, with the resulting code, logs, and feedback feeding into subsequent rounds of exploration. This established an early-stage recursive self-improvement loop.

This reminds me of one of the predictions from https://ai-2027.com/ . Only that there it's "OpenBrain" doing this, not the Chinese. And the authors of that paper were also slightly wrong about "Mid 2026: China Wakes Up": China woke up already a while ago. And:

> But China is falling behind on AI algorithms due to their weaker models. The Chinese intelligence agencies—among the best in the world—double down on their plans to steal OpenBrain’s weights.

No need to steal anything, they have already caught up.

And then there's this prediction for February 2027:

> Officials are most interested in its cyberwarfare capabilities: Agent-2 is “only” a little worse than the best human hackers

I think we're past that point now, too…

bredren 6 hours ago

If the distillation "attacks" created useful inputs to open weight models, ai-2027 was directionally correct that the Chinese would find ways to extract IP from western firms. (Scaled account creation and grinding outputs etc is not a dramatic story element as spies, though!)

Whether the distillation has constituted "attacks" or has or will meet the bar of "stealing" IP is not super interesting to me, though.

judge2020 4 hours ago

Don’t need a “better” hacker if you have ten thousand AIs all trying literally every single possible thing to exploit a system with. The main issue is that this will eventually bring down the exploitation cost enough to target very minor targets who weren’t worth it before.

try-working 6 hours ago

Just like how Windows 95 contributed to its own development process.

0xbadcafebee 6 hours ago

The AI 2027 paper/website is exactly the same as random guesses from tech bros after a couple of beers telling you what they think the future will be. It has nothing to do with political theory, economic theory, game theory, or any other quasi-scientific or rigorous evaluation of real world events and predictable outcomes. It's just vibes. If they're wrong nobody will notice, if they're right people will call them geniuses.

minimaxir 9 hours ago

Hy4 apparently has ludicrous traction on OpenRouter already (https://openrouter.ai/tencent/hy4-preview), with trillions of tokens processed in a couple days: more than GLM 5.3 in a week. That said, it's relatively cheap with a 5% cache cost when everyone is still doing 10%/20% cache costs, so Hy4 may be more compelling.

martinald 8 hours ago

I wrote about this a couple of weeks ago. It's actually often the biggest cost and it tends to be hidden away on most platforms!

https://martinalderson.com/posts/watch-out-for-cache-read-co...

Btw I still haven't came across any decent model that is <$0.01/MTok cache costs apart from deepseek thru their official API (even with the price increases).

Seems like a bit of an opportunity for someone to take - drop cache read costs significantly.

sieve an hour ago

For me, an average long session results in about 200-300M cached input, 4-800K input, 2-400K output. Mostly the lower bound. Output depends on how much the model thinks.

There are two problems here:

- cache hit pricing (both Muse Spark 1.2 Contributor and MiMo 2.5 are around the $0.002-3/M mark)

- cache persistence time

Muse Spark drops the cache in less than 5m. MiMo keeps it around for at least an hour based on my experience with whoever is serving it for OpenCode. This difference itself will inflate bills massively.

A 500K token input repeatedly read by MS 1.2 for full input price 12 times an hour = $0.60. You would be expecting $0.012. So a 50x difference. Same thing on MiMo 2.5 is $0.018 because of longer cache times.

dakolli 7 hours ago

That's because Deepseek invented the paradigm of prompt caching, they are the SOTA when it comes these techniques. Despite them open sourcing all their research, nobody beats them.

edit: I do wish openrouter would let you sort providers by Cache Hit % and Cache cost. These are the only things that matter to me at this point when choosing a provider.

Bolwin 7 hours ago

orbital-decay 6 hours ago

minimaxir 7 hours ago

joegibbs 4 hours ago

If you’re Tencent you can just plug it into some field somewhere that lots of people see right? Like how Meta could put their model on Instagram search

redox99 6 hours ago

It's very likely tencent games those stats, buying their own tokens.

Dinux 8 hours ago

Which explains why almost none of my request go though

cyanydeez 9 hours ago

i'd be curious if openrouter is just being gamed by these publishers by paying for the exposure.

wouldn't trust they dont do Capitalism like the rest of the AI field.

drob518 8 hours ago

Of course they are. Of course they do. Nobody should be surprised by this.

tokai 8 hours ago

>dont do Capitalism like the rest of the AI field

Like lobbying the US president to harm their competitors?

realo 8 hours ago

jamienk 4 hours ago

Genuine Q about word optimization/token density:

If we create a stripped-down vocabulary with greater token density to use less resources and to resolve ambiguities earlier in the semantic process, aren't we creating NEWSPEAK and dragging along the worst aspects of it? The ambiguity and multi-valence of words is what creates more connections between words, increases the directionality of associations, and expands the potential subtlety and depth of meaning. By paring down (or requiring verifiability) we make it harder to say certain things, or at least make it harder to unintentionally say something that makes MORE or DEEPER sense than what we intended. If the token density becomes extreme, you're left with something like a calculator.

Maybe this is the ultimate path toward better coding? But the worse path toward better genuine thinking?

nbush 3 hours ago

This is one of the dangers. AI boosters would say that humans already do this compression and it was accelerated by mass media and then the internet, and that model memory + context can be broad enough that compared to human capabilities the opportunities for depth and variability are even greater. But I think we know which way this optimization usually goes. Even the notion of a "fine-tune for subtlety" is a contradiction.

vatsachak 3 hours ago

Nah reducing token length means that we're just reducing English down towards a programming language like a nice demi-glace

dnautics 3 hours ago

I don't think so. It's pretty clear that LLMs use the higher level layers for reasoning, so a bit of logorrhea very possibly enriches the result quality.

fastball 8 hours ago

I wish model providers would stop committing chart crimes in their releases.

- if you're gonna order the rest of the bar chart by rank, order your model accordingly.

- if you're gonna highlight a winner in a table of benchmarks, don't highlight your entire model row in the table.

Etc etc

mirekrusin 7 hours ago

Read websites through llm.

jorl17 8 hours ago

I experimented with Hy3 for a project and was surprised with how good it was. I don't know if it's good for coding, but as a general purpose agentic model, it was only beaten by deepseek4-flash in our tests. It was so close to deepseek behaviour I kept thinking it must have been forked from it.

alexfortin 3 hours ago

For the last few days I've been experimenting with the _free_ version of Hy3 offered by Opencode Go and I was also surprised to see how (relatively) good it is on coding tasks too.

The free quota from Opencode Go is also surprisingly generous, I perhaps hit limits one or two times and I've been using it _a lot_ for implementation tasks (using e.g. GLM-5.3-flash for working on specs and planning next steps).

Zigurd 8 hours ago

Is anyone here working on a problem for which current generation LLMs are inadequate, but that could possibly be solved by the next release of a first tier LLM?

Or is it like bicycles? Unless your problem is named Tadej, you don't need a $13,000 bike.

comex 8 hours ago

My experience is that even Opus 5 still tends to write buggy or low-quality code and makes serious mistakes when analyzing code. It's a lot better than before but still not something I trust. I've had less experience with Fable since I can't use it at work; I hear it's a step up but still has its limits.

For large tasks like a web browser or a compiler, even expensive swarms of frontier LLMs have not been shown capable of producing codebases that actually work. (Anthropic built a C compiler with Opus 4.6 but it lacked optimizations and apparently hit a complexity wall.)

I also want to use LLMs for reverse engineering, but apparently it's pretty hit-or-miss, especially if you're forced to use open-source models to avoid restrictions.

Zigurd 6 hours ago

This reply is particularly interesting to me because most of my experience with actually using LLMs to get work done is with coding agents. But I only have a fairly narrow set of experiences: two pretty large solo Flutter projects. I am currently really pleased with Gemini as a coding agent. It could improve, but I think improvements are going to come from marginal gains in the harness and training material so it can catch things like misconfigured permissions in platform specific areas.

It's also interesting because, while coding agents are important and are a notable success, they are never going to be a multi trillion dollar business. And are there any other domains where LLMs have such a large impact?

RGS1811 8 hours ago

For me personally, the answer is no. Fable is adequate to do basically anything I want to do. My perspective, broadly speaking, is that we've saturated most of the benchmarks because we've largely saturated our capacity to verify models' work at scale. What's left is context-bound verification, i.e. the problem of ensuring that output matches intent and ambiguities in prompting were resolved correctly. Further advances in autonomy do not make that latter verification problem easier. If anything they make it harder as the output per task becomes more complex and therefore more taxing for a human to verify.

The solution to that (to my mind) would be not a better model but a basic shift in architecture beyond the current paradigm and into a setup where agents have durable, plastic memories and undergo contextual individuation over time. But at that point agents start to become quasi-persons and not tools.

lopatin 7 hours ago

I asked a current generation LLM to make me $1k a week and it hasn't so far.

arjie an hour ago

3d modeling to an STL a part compatible to a visible cable raceway still fails even if I let Claude Fable use me as a robot that measures with calipers.

spacebanana7 8 hours ago

I want to be able to generate my own Simlilirian movie by dumping the content of a book into an LLM.

Both animated and live action results would be acceptable.

Unfortunately most existing LLMs lack the capability to maintain context across tens of thousands of frames.

Demiurge 7 hours ago

That sounds like an interesting challenge. Have you seriously considered solving it? Because in about 10 seconds I came up with a process that should work, provided enough compute power. Simply model the traditional film making process by starting with a script, character stories. Design your world, then design the storyboard, and all the scenes. Create a list of all the visual elements that need to be replicated between all the scenes. Then you have to built prompts and reference art of the objects, faces, people. Make sure to do multiple takes of each scene, and have the vLLM critique and analyze the performances and technicalities. Should work?

I think, also, like in the traditional film makers career, this process should be built iteratively, start with a fast food commercial, then do a music video, then you can probably do a short film. Continue to improve the process, and one day I’m sure the LLM film studio can make you any movie you want, provided you have enough tokens.

andybak 7 hours ago

bsenftner 6 hours ago

aforwardslash 6 hours ago

bsenftner 6 hours ago

The results are boring. Not because the content is boring, but because you can so easily remix the results. Human curation is what creates value with these, not dumping and consuming. A personal perspective of a human being ups the respect, where the exact same sentences generated by an LLM carry no such value.

Zigurd 6 hours ago

I think this is the best and most realistic reply so far: the ability to do this is close enough, and things like AI music are hints that there is a business model for this. Maybe I'm just jaded about CGI effects in movies currently, but I think the fact that people except that kind of thing as entertainment means you might get away with a fully AI movie that people will pay for.

There are two more points in favor of this kind of AI movie project: there's zero chance that anyone would greenlight a Hollywood budget for the Silmarillion, and it is beyond human capability to write that screenplay.

RobotCaleb 6 hours ago

How would a computer generated video be live action?

clipsy 3 hours ago

Since live action results are acceptable, this is already possible with current day LLMs. Just instruct one to hire a writer, director, cast, and crew to make the movie.

Plus, the token costs involved should be pretty low! (Other costs may not be.)

ezst 7 hours ago

I saw a laptop earlier in the train that I asked ChatGPT, Claude and Gemini what it was, providing a brand, screen size and ports description. Gemini could never figure it out, Claude and ChatGPT eventually did, after multiple rounds of indirection, giving completely wrong answers (there was a perfect match for the problem statement, they all explored alternatives first). LLMs are (probably) amazing at things I don't care about, and still suck at the mundane stuff you would have the marketing tell you they excel at.

er4hn 7 hours ago

I was given a picture cube, which is like a Rubik's cube but every side is a unique picture. It came scrambled and I don't have an original reference image. I like to take videos of it and give it to llms to solve. I call it my agi test because it hasn't been solved yet

vessenes 6 hours ago

Yes. Most of us are, still. The frontier is currently both at expanding ‘common sense’ / non-cheating outcomes for imprecisely specified software (that’s all software), and at expanding autonomy - ability to work longer unsupervised with success, oh, and also at expanding outside contextual reasoning about what’s being built, as in “hmm, that doesn’t look right or make sense, let me explore that.”

pianopatrick 4 hours ago

I think the tech analogy for frontier models is going to be super computers.

Super computers keep getting better but most people don't need them for most things.

eunos 37 minutes ago

2000's supercomputer is today's (highest end) smartphone performance tho

hgoel 6 hours ago

Scientific physics simulations - even the frontier models just engage in rationalization of obviously unphysical results instead of understanding the system. They have the rote knowledge but fail to apply it unless their hand is held through the process.

_factor 8 hours ago

Hardware debugging and firmware details lead to thinking/testing loops on all but the frontier here.

tekacs 7 hours ago

Yes, lots – I think that folks will hopefully discover more of these as they scale up their ambition, now that LLMs make a lot of previously difficult things far easier.

jml78 6 hours ago

Infra as code and devops shit. Fable is there in general because things it doesn’t know I can point at documentation and have it do a reasonable job. Opus 5 sucks. If I don’t have fable quota, I drop to Opus 4.8 and hold its hand.

jiggawatts 7 hours ago

This is the exact same type of comment I heard about computer hardware upgrades for three decades in a row.

“Very few people actually require a Pentium workstation, a 486 is perfectly adequate for the majority”

The logical fallacy is taking an extant distribution of “product capability” that is priced to fit what the market will bear and assuming the “next upgrade” simply tacks on a little bit more to the right hand rail of that curve.

No!

It shifts the entire curve!

Everything for everyone gets better and the top 1% of the most demanding users will continue to pay the same-ish premium.

“Nothing” will change.

Look at it this way: you can buy a $200 laptop for your kid or a $20,000 Mac with an M5 Ultra processor.

BOTH are vastly more powerful than either a $200 PC or a $20,000 “workstation” from 20+ years ago.

Look at: https://arena.ai/leaderboard/text?q=openai&utm_source=chatgp...

The “budget” 5.5 Instant model beats o1 and o3 which were “pro” models at the time of their release!

Zigurd 6 hours ago

Intel didn't just surf some natural wave of demand for higher power personal computers. Intel found new needs for powerful PCs, especially in gaming, and they put a lot of marketing and industry relations dollars behind PC gaming.

In other words. PC users didn't figure out that they could buy super powerful PCs and play games on them, that was a carefully managed market transition.

What is going to do the same for LLMs?

jiggawatts 5 hours ago

tokai 8 hours ago

A spanish rock solved that problem for free.

nozzlegear 7 hours ago

¿Como?

dakolli 7 hours ago

I get buy with very cheap models and actually using my brain, you don't need these SOTA models. China will definitely win this AI 'war'

kennywinker 7 hours ago

If the models stay open, it seems like everybody but anthropic/openai wins. i literally can’t see a downside. We can post-train the models to know about tienanmen square.

zem an hour ago

I was briefly impressed that https://hylang.org/ had released a 4.0 version!

vatsachak 7 hours ago

I'm liking where LLMs are headed:

They can do the difficult small level optimization, the boring but tedious code but cannot be tasteful.

That means I'm more valuable and more productive. Good stuff

handfuloflight 3 hours ago

This guy gets it.

joshheitzman 5 hours ago

Maybe's its a problem with the hosting at novita.ai but I didn't got much useful out of this model as a coding agent.

coder543 5 hours ago

Novita does not offer Hy4-preview on either OpenRouter or their own model list. Maybe you confused it with Hy3.

joshheitzman 3 hours ago

You are correct.

XCSme 8 hours ago

I tried benchmarking it, but it keeps timing out/rate limiting, so the current provider(s) are unusable.

yipinwong 5 hours ago

I am going to bring up graph issue for everyone of these announcements.

They all suck.

They shoulda put their stick where they belong, not at far left.

It just makes comparison to Deepseek 90% of them time as Hy4 has nothing to show off.

bobby_coder_55 4 hours ago

Unfortunately codebuddy login is not working for me in the United States of America

vcryan 9 hours ago

I used Hy3 quite a bit for the type of tasks it was suited for. Excited about this. My one concern over Hy3 was speed. In theory, it could be served much faster as a smaller model but it was relatively slow everywhere I could get it (including from Tencent directly) but also several other inference providers.

Topfi 9 hours ago

In my evals, I saw an unprecedented jump between preview and final release on Hy3, from unusable to competitive. Did you see similar in preview vs release version?

vcryan 8 hours ago

Oh yes! I forgot about that. Yes, you can see this in benchmarks about hy3 preview and hy3 release still today because they measured them separately - it was significant.

ls612 5 hours ago

Open Weights is where the action is at in the past couple months, I’d have to think the US frontier labs are getting nervous. Like Anthropic hasn’t released anything pushing the frontier since “the event” earlier this summer.

andsoitis 6 hours ago

> open-sources

link to source code?

usernomdeguerre 8 hours ago

is it just me or are the bar charts in the blog post strange? Higher numbers don't seem to correspond correctly to their actual height?

pixelesque 7 hours ago

Looks okay to me.

The first column has both the Hy4 and Hy3 scores overlaid on one another (Hy4 is darker blue and the taller one), with both scores written below the top of the respective bar - maybe you're seeing that?

alanfranz 8 hours ago

Probably AI generated.

But, what bars are clearly off? I couldn't spot any.

feynmanquest 8 hours ago

Noticed that as well

throaway2525634 6 hours ago

I, for one, welcome our new Chinese overlords.

sezaidemirer 7 hours ago

Congratulations, it turned out great!

petcat 8 hours ago

> Tencent has released and open-sourced Tencent Hy4 preview, a next-generation large language model with 770B total parameters and 49B active parameters, and a context window exceeding 1M tokens.

There are no open source models, at least not useful ones (yet) [0]. Open weight is not the same as open source. The current "open weight" models are just opaque binary blobs you can run on your own computer instead of through a web API.

[0] https://allenai.org/

Imagine thinking that running a Photoshop binary on your own computer instead of through a SaaS web app means that it's "open source". Of course you think that's ridiculous.

mirekrusin 7 hours ago

You can open source dataset without all the details how it was assembled.

Models are lossy compressed datasets you can pick up and amend (fine tune / continue training / alter) according to license they were released under.

Hy4 is released under OSI approved Apache License 2.0.

kennywinker 7 hours ago

Parent poster is technically right - open “source” implies the source used to make something is open. The model source is training data and code, not just weights.

But the reality is, the weights are a useful artifact that you can use to create derivative works. So, dismissing it as a photoshop binary is as technically wrong as calling it open source.

villish 6 hours ago

Countries that aren’t competitive need access to training datasets so that they may train their own similarly capable models and be sure of the inputs. Governments cannot blindly trust open weight models from China and the US.

LtWorf 6 hours ago

So windows is open source because the binaries are a lossy compression of the original source?

NitpickLawyer 25 minutes ago