Rodrigo Barros

Doutor em computação pela USP. Professor adjunto da PUCRS. Pesquisador em Machine Learning. Sócio-fundador da Teia Labs, startup de IA.

[IplanRio @IplanRio_rj]

NOTE ON RIO 3.5 OPEN

In recent days, Rio 3.5 Open has received far more attention than we anticipated. Along with it came analyses and, of course, criticisms and questions.

First, we want to clarify that the model is not foundational, trained from scratch, nor was it ever communicated as such. It is a post-training project built on open models, following classical approaches and some experiments. We started with open baseweights and applied various techniques, including merging, OPD, and finally used inference with SwiReasoning.

It was precisely thanks to the community's attention that we identified an operational error in the publication process. We ended up making available an intermediate checkpoint that had not yet completed all the final validation and optimization steps. This generated interpretations that, looking back now, we fully understand. The checkpoint has been removed. We tried to recover the final model, but it was not possible. It will only be released after the new training and all external validations are completed.

We also want to correct an important attribution point. Our team used public models provided by Alibaba, through Qwen 3.5, and by Nex-AGI, through Nex-N2 Pro, as a basis. In the initial documentation, we did not include Nex's important contribution. Correctly recognizing who builds these foundations is part of the open development process. Thank you, Nex, for your work and for contributing to advancing the state of the art in open models.

It is worth contextualizing that there was no official release of that version of the model. The project ended up gaining traction organically and unexpectedly while it was still undergoing independent validations. In any case, this shows that there is interest and that Brazil has more space in this conversation than we usually imagine. We hope to see more initiatives emerging in Latin America, India, Africa, and other places that seek to expand their technological sovereignty, especially at a time when Fable has been closed to the rest of the world and access to frontier models has become part of the global strategic debate.

Rio 3.5 Open is just the beginning. We will correct what is necessary, continue developing openly, and share what we learn along the way. Our goal is to show that the Brazilian public sector can also learn, build openly, and contribute to the forefront of current technological research.

[Pedro Ronchi @PedroRonchi2]

O próximo jogo do Brasil é contra o Haiti. Em um amistoso contra o Haiti em 2004 o Ronaldinho fez isso.

[Jodarismo @JodarismoATP]

Esto es una de las mayores locuras que he visto en el tenis🎾

Carlos Alcaraz y Roger Federer hacen un punto idéntico en Roland Garros.

El elegido de Dios🇪🇸

[BrunoGuedes1983 @BGuedes1983]

O Japonês Kubo é o primeiro jogador com nome de uma forma geométrica a disputar 3 mundiais.
Superou Redondo e Cuadrado, ambos apenas com duas participações.

[guillem 🦆 @vinates]

Yo creo que nadie a día de hoy juega como Sampras, eh

[Intercept Brasil @TheInterceptBr]

Desde que o Intercept revelou as negociações entre Flávio Bolsonaro e Daniel Vorcaro para financiar o filme Dark Horse, aliados do bolsonarismo passaram a afirmar que não existiam provas das transações financeiras. Documentos obtidos por nossa equipe desmentem essa versão e ajudam a reconstruir o caminho percorrido pelo dinheiro.

Segue o fio para mais detalhes 🧶👇

[Bruno Guzzo® @brunoguzzo]

Simplesmente o Octavio Guedes mandando um “Tariflávio” ao vivo na GloboNews e dizendo que as mãos do Flávio Bolsonaro estão amarelas. “Esse mau cheiro é dele. Eles comemoraram o tarifaço. Tem DNA bolsonarista.”

[João Praetzel @joaopraetzel]

Um crossover que eu nunca imaginei ver kkkkkk

[André Rizek @andrizek]

Brasileiro que fala mal do João Fonseca porque caiu nas quartas-de-final de Roland Garros não gosta de esporte... Só gosta de ganhar. São duas coisas diferentes. Parabéns, João!!! Vamos pra próxima. Jogou demais nessa campanha.

[Glenn Greenwald @ggreenwald]

All predictive statements, perhaps especially ones predicting sport competitions, often turn out to be not just wrong but embarrassingly so.

But I've never felt as vindicated when making one of those predictions as I do about this one from March:

[Faria Lima Elevator @FariaLimaElevat]

Troco o Hexa por Roland Garros.

[sashi @puresinnema]

yeah i can't lie we might have to ban carlos and jannik from every slam moving forward i was not aware they were preventing THIS level of cinema... even the sides of the draw they don't impact guys are just playing with a different level of belief and fight

[Marcelo Brigadeiro - o terror do Nando Moura @CascaGrossaReal]

SILÊNCIO!
Nosso amigo Flavio Bolsonaro está combatendo o CV conversando com o MAIOR agente político do CV que temos conhecimento até o momento.
Só otário acredita nesse mentiroso!

[Paula @plaoliveirac]

Looks like Jodar doesn’t like kids 🥲

[TNT Sports U.S. @TNTSportsUS]

"I felt like John Isner." 😆

@JohnIsner himself couldn't believe João Fonseca's shoutout in his post-match interview 😂🔥

[José Morgado @josemorgado]

WHAT A MATCH!

19 year old João Fonseca becomes the second player to beat Novak Djokovic from two sets down, defeats the 24-time Grand Slam champion 4-6, 4-6, 6-3, 7-5, 7-5 to reach his first Major R16 at #RolandGarros.

Epic stuff in five hours.

[José Morgado @josemorgado]

GOING FIVE!

João Fonseca was two points away from losing, but he forces a DECIDER against Novak Djokovic.

From two sets down.

4-6, 4-6, 6-3, 7-5.

Crowd goes nuts.

[Simon Kane🇧🇷 @PiklesT]

Tá com medo do que, excelência ? Se quebrar o sigilo do vagabundo, vai te comprometer? 🤔🤔

[Natália Bonavides @natbonavides]

Como a gente faz para que empresários milionários deixem de ser tão dependentes do Estado com tantas isenções fiscais, subsídios e perdão de dívidas? Ou esse discurso só funciona com os pobres? Pro rico é “incentivo”. Pra mãe alimentar o filho, não pode?