108 pointsby unrvl222 hours ago15 comments
  • hintymad7 minutes ago
    > Every weight tensor in Rio is, to thousands of standard deviations, the same 0.6/0.4 blend of Nex and Qwen — across all 60 layers and every component of the network. Other finetunes cannot be explained as interpolations.

    I find it amazing how robust the current deep learning models are. A simple linear combination of every weight did not degrade the performance of the model, but enhanced it.

  • zinodauran hour ago
    Oh no, someone is profiting off of their work without proper attribution!?!?
    • Aurornis27 minutes ago
      This is an open weights model based on other open weights models.

      The dispute is that they released it with claims about having done some post training that improved the outputs. It was discovered that the model was not post trained like they claimed.

      The HF page now says it’s a merge of models, which wasn’t there before. They’re trying to claim they accidentally uploaded the wrong model to HF and that they’ll upload the real one soon.

      Basically, they thought they could splice two open weights models together and claim their team had accomplished some amazing post training, but they weren’t smart enough to realize that other researchers would discover that there wasn’t any post training.

      • moritzwarhier22 minutes ago
        Thanks for the factual clarification. This is so important when everyone already has their trigger finger on politics. Not meaning that politics are irrelevant here, see sister comment by jobim.

        But it's impossible to form a nuanced opinion when political association has a higher priority than the facts; which, again, don't look flattering for the implementers.

      • iknowstuff10 minutes ago
        How do they just splice two models together?
        • Aurornis4 minutes ago
          The Nex N2 model they merged is based on Qwen 3.5, so you can swap pieces of one into the other. They found a combination of the two that did well on some benchmarks and shipped it.

          In the early days of Llama there were a lot of experiments like this. There were even some interesting combinations of models where they stacked layers of different models together or even added more layers with interesting results.

          But announcing that you spliced two models together isn't very impressive in 2026, so they announced that they had done their own post training and outdid the big labs. They thought nobody would look close enough to notice.

    • carlosjobiman hour ago
      This is a pure scam on tax payer money. But what else would be expected?
      • jrm439 minutes ago
        Unlike the big companies who do this, which often are merely impure scams on tax payer money a little more downstream.
        • carlosjobim27 minutes ago
          Great, now we're defending embezzlement and fraud with public funds on HN, because we really really hate big business.

          A child caught doing something bad will cry "but my friends also did it!", is that the level of reasoning hackers want to be at?

          • sdevonoes2 minutes ago
            There are no hackers around here anymore. HN is mainly about business nowadays
          • blanched20 minutes ago
            That seems like a bad faith read to me. Nobody is defending it, just pointing out the irony / hypocrisy. Two things can be bad, and they can be related.
          • jrm423 minutes ago
            What part of that said "defense?"

            They can both be bad.

    • internet2000an hour ago
      Attribution isn't the relevant part. Lying about your lab's capabilities is.
      • Planktonnean hour ago
        That's also something all the AI companies have been doing.
        • dofman hour ago
          Lying about model capability is right now the lingua franca of the cloud AI business model, almost; they yes-and each other's lies because they are in a position of needing to generate interest, including going as far as needing to trigger regulatory capture.

          (It's not news to anyone who has worked in sales-led businesses that salespeople are prone to believing the claims of other salespeople, I guess).

      • adrian_ban hour ago
        I do not see anyone lying.

        The model card says:

        > Post-trained from Qwen 3.5 397B

        The model card also says that they use an inference framework based on "SwiReasoning: Switch-Thinking in Latent and Explicit for Pareto-Superior Reasoning LLMs" by Shi et al.:

        https://arxiv.org/abs/2510.05069

        So the sources seem properly attributed.

        They only claim that what they did to "Qwen 3.5 397B" has improved the LLM, including, as expected, with "strong performance in Portuguese".

        • petu28 minutes ago
          That's attribution to Qwen team.

          There (is/was) no attribution to Nex team (they've released a model based on Qwen 3.5 397B as well).

          As per OP link Nex claims that what Rio team released (so far) is just linear interpolation of weights between Nex and OG Qwen model. With no attribution to Nex and zero signs of Rio doing any training of their own.

        • 00index31 minutes ago
          Are you talking about the credit that was just updated an hour ago? lol
      • outside234429 minutes ago
        But the whole game is lying and stealing isn't it?
      • functionmousean hour ago
        leopards ate my face
    • an hour ago
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    • clear-octopusan hour ago
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    • woadwarrior01an hour ago
      Are you new to the latest AI hype cycle? /s
    • bachmeieran hour ago
      "Their work"? First you had the original content creators that did 99.99% of the work. Then you had the US companies bundle it up into a frontier LLM. Then "they" did the "work" of using the US model as a foundation for their own. So in the sense of doing 0.00001% of the actual work that went into their product, sure.

      I'd say it's more like someone forking a Linux distro, adding a few themes and fonts, and then complaining when someone else forks their distro and adds another theme.

      • dghlsakjgan hour ago
        That’s the joke.
      • JoshStroblan hour ago
        That joke really went over your head, huh...
      • bwilliams18an hour ago
        That was the joke of the parent comment.
      • harikban hour ago
        It is only a problem if you claim it to be an independently developed OS with no attribution to base
      • idiotsecant44 minutes ago
        Oof this is delete your post level I think. Sorry bud, I been there.
  • unrvl222 hours ago
    The municipality of Rio de Janeiro (via its IT company IplanRIO) released Rio-3.5-Open-397B, presented as a homegrown Qwen3.5 fine-tune that beats comparable open models on benchmarks. The linked issue argues it's actually a weighted merge of ~60% Nex-N2 Pro + ~40% Qwen3.5-397B-A17B - Nex-N2 having been released about a week earlier.
    • DonsDiscountGas25 minutes ago
      I didn't know model merging like that was possible. (Obviously possible from a pure software standpoint but I'm surprised it's effective)
    • Lucasoatoan hour ago
      So the problem isn’t in the missing attribution to Qwen, but with the fact that they didn’t mention Nex-N2 Pro right?
      • Aurornis25 minutes ago
        The problem is that they claimed to have made a big achievement with their home grown post training, and they expected to receive a lot of praise for it.

        Then researchers looked at the weights and there is no post training at all.

        They are now attributing both models they merged, but their excuse for the lack of post training is to claim they accidentally uploaded the wrong files.

    • an hour ago
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    • clear-octopusan hour ago
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  • fkozlowskian hour ago
    I'm honestly surprised that they even had the inclination to attempt creating a model. I guess it's bullish that a municipal IT department had the guts to try this?
  • AlienRobotan hour ago
    The model's webpage at https://huggingface.co/prefeitura-rio/Rio-3.5-Open-397B says it's a merge now. It previously didn't contain this paragraph:

    >The model is built via a merge of https://huggingface.co/nex-agi/Nex-N2-Pro and https://huggingface.co/Qwen/Qwen3.5-397B-A17B, proceeded by On-Policy Distillation from a stronger model. We detected an incorrect upload in the previous version, where the base merged version was upload instead of the final distilled model. We are sorry for the confusion and apologize profusely.

    Incidentally are people using Github issues as blogs now?

    • jonchurch_13 minutes ago
      It wasnt framed as an issue which is the norm breakage I think you’re reacting to, as in they didnt ask that the readme be updated etc, but it is common now for folks to use a project’s issue tracker to name and shame them in a place they cant easily ignore.

      Whether that’s right, prosocial, or professional is up for debate (as well as if any single definition of etiquette can be expected in 2026 on an issue tracker).

      But surely you can see the optics reason why someone would take their complaint to the repo directly? It pressures the maintainers to respond, it allows for a pile on from the internet, and makes any decision to lock down a hostile thread into its own kind of statement.

      The maintainers should absolutely post an official response and lock the thread though, it will likely get ugly in there.

  • jrm436 minutes ago
    “Well, Steve (Jobs), I think it’s more like we both had this rich neighbor named Xerox, and I broke into his house to steal the TV set, but I found out that you had already stolen it.”

    -- Bill Gates

    • ckcheng3 minutes ago
      What’s more funny to me is the set up to that quote:

      > Bill Gates had somehow manifested, alone, surrounded by ten Apple employees. … Steve started yelling at Bill, asking him why he violated their agreement.

      And what’s more interesting is the conclusion:

      > Apple filed a monumental copyright lawsuit against Microsoft in 1988, but they eventually lost on a technicality (the judge ruled that Apple inadvertently gave Microsoft a perpetual license to the Mac user interface in November 1985).

      Microsoft didn’t steal Apple’s GUI … Apple gave it to them.

    • wunderlotus19 minutes ago
      lmao i really hope this is a real quote cuz it’s a banger
  • AnotherGoodNamean hour ago
    This is fascinating that it worked though. Can we just merge all the open weight models and get something better?
    • nylonstrung2 minutes ago
      If you go to Civitai this is pretty how it works in that corner of the image generation world

      Everything is using Stable Diffusion as underlying model, then most of the usage is merged of checkpoints

    • wdsan hour ago
      I imagine it'd work the same as merging all the good-tasting foods to get an even tastier one
    • avereveardan hour ago
      most merge improve a small subset of "feeling" benchmark (too small, too specific, or out of distribution) and tend to show degradation on actual benchmark, with especially punishing result on long chain benchmarks.

      also only work on matching architectures (i.e. finetunes/loras of the same model)

    • dindunufan hour ago
      that kinda worked in llama 1/2 era, not between different models but between finetunes of the same model. the briefly legendary Mythomax was IIRC a merge of 5+ tunes, some of which were merges themselves.
    • _3u10an hour ago
      No, they need the same arch, but you can distill them into a single model. And yes, if you use the API directly Claude will often say it’s an open weight model (likely the ones it was distilled from)
  • MadrasTh0rnan hour ago
    Not surprised
  • ekjhgkejhgkan hour ago
    One funny thing about incompetence is that they don't have the competence to know that their incompetence is straightforward to verify by a competent person.
    • root-parentan hour ago
      You just described every single vibe coder...
    • thimabi37 minutes ago
      I wouldn’t describe what happened here as incompetence. As a “carioca”, I am pleasantly surprised to know that the government’s IT department is involved in AI work — even without the budget to create its own models from scratch.
      • arcticfox30 minutes ago
        This seems kind of insane though, every time I go to Rio I think of the potential of AI/technology to solve some problems and leave it even more paradisiacal... But working on their own model? Wtf? There are a million applications of existing ones there that should be followed up on instead.
    • carlosjobiman hour ago
      Why would they care? They get their salaries and pensions and bonuses, and the tax payer is footing the bill.
  • yieldcrvan hour ago
    Didn’t the last thread about this have someone from the lab or an enthusiast in Rio saying exactly that?

    Its a fine tune of Qwen

    Not a conspiracy

    • daemonologist41 minutes ago
      The allegation here is that it's not actually a fine-tune of Qwen, but instead an undisclosed mashup (merge) of someone else's fine-tune of Qwen and the original model. Rio subsequently said that the model was in fact a merge, that they did additional fine-tuning after the merge, and that they accidentally uploaded the base merge instead of the version with additional fine-tuning. But this seems like quite an oversight...
  • Aurornisan hour ago
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  • antii44 minutes ago
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  • elzbardico2 hours ago
    [flagged]
    • guiraldellian hour ago
      Without evidence, your comment is just bad mouthing.

      I have been involved in academia, including in Brazil, and I don't find academia there any more copycat than any other institution, including top tier ones.

    • dghlsakjgan hour ago
      This was a municipality working with a government associated IT company.

      What does it have to do with Brazilian academia?

    • _3u10an hour ago
      No, typically Brazilians go to Paraguay for their education, most of their technology comes from Paraguay too.
      • knupparan hour ago
        that's just a lie lol, stop spreading misinformation
      • cassiogoan hour ago
        What? Never heard of this
        • stymaar42 minutes ago
          That sounds like nonsense, they don't even speak the same language in Brasil and Paraguay …
  • alfiedotwtfan hour ago
    Wasn’t it already obvious given the awfully familiar parameter numbers?