Mihai Maruseac

Mihai Maruseac

@mihai.page

Building AGI with Privacy and Security at OpenAI. Previously: ML Supply chain security @ Google OSS Security Team (model signing, GUAC). Previously: TensorFlow Security & OSS (@ Google) Previously: Haskell+differential privacy+ML @ LeapYear

3.3K followers2.7K following162 posts

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Mihai Maruseac
@mihai.page

Even with the Trump intervention to cheat out of a red card, the US got owned today. So hard that people would say "stop the count" once again. Gg Belgium! Good game

Mihai Maruseac
@mihai.page

Dear @caltrain.com , I took 3 trains today, northbound and southbound, in the morning and in the evening. None of them had Wi-Fi working, for the entire duration of the trips. Unacceptable in the land of AI and tech startups.

Mihai Maruseac
@mihai.page

In the AI era, if you have a bug in production code you actually have at least two. One bug is in the test suite, it should have surfaced the issue when the agent wrote the code.

Mihai Maruseac
@mihai.page

"If they ever tell my story let them say that I walked with giants."--Troy I'm humbled&excited that the model we released last week is now trending as#2 on HuggingFace,between giant models like DeepSeek,Qwen,and Kimi. Excited that the community finds this useful; looking forward for more work here

Mihai Maruseac
@mihai.page

SHIPPED: My first release at @OpenAI with a ton of work from an awesome team: a privacy filter model that is small enough it can run in the browser while also pushing the frontier in the space. Also CLI tool to use model. Both under Apache 2.0. Read more: openai.com/index/introd...

openai.comIntroducing OpenAI Privacy FilterOpenAI Privacy Filter is an open-weight model for detecting and redacting personally identifiable information (PII) in text with state-of-the-art accuracy
Mihai Maruseac
@mihai.page

I am really excited to read this blog and see this news! OSS-CRS to use AI to find and fix vulnerabilities while treating maintainers humanly, not swarming them with issues and PRs!

OpenSSF@openssf.org

Welcoming OSS-CRS to the #OpenSSFCommunity Following the success of DARPA’s AI Cyber Challenge (AIxCC), we are thrilled to announce that OSS-CRS is joining the OpenSSF under the AI / ML Security Working Group. openssf.org/blog/2026/04...

Mihai Maruseac reposted

OpenSSF
@openssf.org

The #OpenSSF Ambassador Program is now accepting applications for its first cohort. We are looking for 10-15 advocates to lead local initiatives, mentor developers, and represent the Open Source Security Foundation worldwide. openssf.org/community/op...

Mihai Maruseac
@mihai.page

After significant deliberations today I decided to get out of the tech job industry. I just sent the "an update on Mihai" email. Starting tonight you can find me as a park ranger in Yosemite. That would be a career that cannot be impacted by AI related layoffs. It's 4/1, folks.

Mihai Maruseac
@mihai.page

Pi Day is almost ending (already did if you look at UTC time, but there are a few more hours in US), so I just squeezed in an article about some geometries where pi is 2, 3 or 4. There were hints on my blog about this, but now this is done and I have more questions for follow-ups mihai.page/pi-2026/

mihai.pagePi day 2026: Other values of piIt's Pi Day today, so we ask: can pi be 2, 3, or 4? We find simple worlds where the answer is yes, worlds that we already talked about in this blog
Mihai Maruseac
@mihai.page

Between this and the new patent for letting AI post after a person's death I'm utterly convinced that Zuckerberg is a sick ghoul

Tim A.@flipperpa.bsky.social

Instagram's boss just claimed that 16 hours of daily use isn't addiction. That's every waking hour, glued to a device, on a stupid app engineered to be addicting. What planet are these people from? www.bbc.com/news/article...

bbc.comInstagram boss: 16 hours of daily use is not addictionInstagram's Adam Mosseri faced questioning about the impact of his platform on minors.
Mihai Maruseac
@mihai.page

I tested 80 models on two simple grid-based problems, asking them to locate 2026 and compute the sum of the neighbors when the numbers are placed in a spiral on the grid. Results surprised me: models performed better on harder problem, but they also cheated. Read more at mihai.page/ai-2026-1/

mihai.pageTesting 80 LLMs on spatial reasoning on gridsHow do LLMs see 2D grids? Would it be harder for them to work on square grids or hexagonal ones? I'm expanding the Kaggle benchmark mentioned in the last article and I'm testing 80 different LLMs. The...
Mihai Maruseac
@mihai.page

Yesterday was my last day at Google. It was a bittersweet departure, leaving a team I really enjoyed working with. GOSST's mission is extremely important and I still believe in it.

Mihai Maruseac
@mihai.page

Today was my first day at OpenAI. Excited about what's to come. Will still work on security and AI. My mission evolves from "OSS must be secure, especially AI" to "Let's build AGI with security and privacy in mind". OSS is still part of my work, so let's keep in touch.

Mihai Maruseac
@mihai.page

I'm currently running 80 different models for this task, some are slow, some are fast. It will take a while until I can get all results. But I'll publish them when ready and announce. Like and subscribe :P

Mihai Maruseac reposted

Mihai Maruseac
@mihai.page

Use `--yolo-mode`, Ralph, Gas Town, or any other automated tools? Beware of agent loops that run out of control. See a less dangerous example on github.com/google-gemin...

github.comallow exit and quit commands without leading slash (/) · Issue #16723 · google-gemini/gemini-cliWhat would you like to be added? This is feature request - someone can point it as bug as well but I will not. Ask / Request 👉🏽 Implement exit and quit as standard commands with a simple confirmati...

Mihai Maruseac reposted

Mihai Maruseac
@mihai.page

step 1: vibe code slop in prod step 2: ??? step 3: "we take security very seriously. Your data is now in our hacker's hands"

Mihai Maruseac
@mihai.page

step 1: vibe code slop in prod step 2: ??? step 3: "we take security very seriously. Your data is now in our hacker's hands"

Mihai Maruseac
@mihai.page

Use `--yolo-mode`, Ralph, Gas Town, or any other automated tools? Beware of agent loops that run out of control. See a less dangerous example on github.com/google-gemin...

github.comallow exit and quit commands without leading slash (/) · Issue #16723 · google-gemini/gemini-cliWhat would you like to be added? This is feature request - someone can point it as bug as well but I will not. Ask / Request 👉🏽 Implement exit and quit as standard commands with a simple confirmati...

Mihai Maruseac reposted

Mihai Maruseac
@mihai.page

New year, new problems to test the LLMs on: arranging the numbers on a spiral, what is the sum of the neighbors of 2026? Read on for more details and some preliminary results, as well as how to suggest other LLMs to test: mihai.page/ai-2026-0/

mihai.pageIntroducing my first benchmark of AI for 2026Just like last year, on this special day, I create a new benchmark to test LLMs on different puzzles. This will not be the only benchmark I run this year, but it might be the only math related one.
Mihai Maruseac
@mihai.page

New year, new problems to test the LLMs on: arranging the numbers on a spiral, what is the sum of the neighbors of 2026? Read on for more details and some preliminary results, as well as how to suggest other LLMs to test: mihai.page/ai-2026-0/

mihai.pageIntroducing my first benchmark of AI for 2026Just like last year, on this special day, I create a new benchmark to test LLMs on different puzzles. This will not be the only benchmark I run this year, but it might be the only math related one.
Mihai Maruseac
@mihai.page

I cannot remember the rule of divisibility by .7., it's always so hard. This is the smallest prime where I have to actually do the division myself

Mihai Maruseac
@mihai.page

Can you name two books, both having the same 10 characters, but being very different in their plot otherwise? There is not just one single solution. I'll post a hint later this week if no one answers by then, but until then please share widely to see if anyone can name them.

Mihai Maruseac
@mihai.page

The books are: - A Million Random Digits with 100,000 Normal Deviates - One Million Digits of Pi They both have the same length (1 million characters), the same 10 characters (the digits themselves). The plot of the first one is very random, whereas the second one has formulas.

Mihai Maruseac
@mihai.page

Two hints: - The books have similar(ish) lengths - The plot of one book is very formulaic, whereas the other one is very random

Mihai Maruseac@mihai.page

Can you name two books, both having the same 10 characters, but being very different in their plot otherwise? There is not just one single solution. I'll post a hint later this week if no one answers by then, but until then please share widely to see if anyone can name them.

Mihai Maruseac
@mihai.page

The books are: - A Million Random Digits with 100,000 Normal Deviates - One Million Digits of Pi They both have the same length (1 million characters), the same 10 characters (the digits themselves). The plot of the first one is very random, whereas the second one has formulas.

Mihai Maruseac
@mihai.page

The books are: - A Million Random Digits with 100,000 Normal Deviates - One Million Digits of Pi They both have the same length (1 million characters), the same 10 characters (the digits themselves). The plot of the first one is very random, whereas the second one has formulas.

Mihai Maruseac@mihai.page

Two hints: - The books have similar(ish) lengths - The plot of one book is very formulaic, whereas the other one is very random

Mihai Maruseac reposted

Mihai Maruseac
@mihai.page

Can you name two books, both having the same 10 characters, but being very different in their plot otherwise? There is not just one single solution. I'll post a hint later this week if no one answers by then, but until then please share widely to see if anyone can name them.

Mihai Maruseac
@mihai.page

Today's lesson in the words of Pompeii: "Οὐ παύσεσθε,” εἶπεν, “ἡμῖν ὑπεζωσμένοις ξίφη νόμους ἀναγινώσκοντες" (that is: "do not quote the laws to people holding swords", in an approximate translation)