alt Hacker NewsBuilding a real-time AI tutor for 5-year-olds
Hey HN! We've spent the good part of this past year building an AI tutor that teaches kids ages 4-9 reading, math, ESL and more. Getting an AI tutor to effectively teach a child turns out to be a really hard technical challenge, this took getting the underlying architecture right.
Our tutor steers the UX in real-time and makes complex decisions on the fly. Doing both at conversation speed required us to replace the standard tool-use loop. We built our own tutor harness that utilizes a streaming interpreter that executes actions, while an asynchronous planner model reasons ahead of the conversation and makes calls that drive the child's learning. On top of it all, we developed a safety system that checks every turn without it causing an interruption to the activity and conversation flow.
Effective teaching isn't just about answering a child's question quickly, rather making the right move at the right moment. AI is also going to be an integral part shaping how this generation of kids learn to read and think, tackling this responsibly means getting the design right.
Happy to answer questions and curious what you all think, critical feedback included, we've been working on this problem for a long time and love to hear from the HN community.
Comments
The Ello team nailed it with 2.0, my kids love using this fantastic learning tool and we love being part of the early beta testing program. I know as parents themselves and as early childhood educators the designers have the best intentions in mind when they built this. The friendly interaction between the Ello character and my kids gives them a fun motivation to take on reading challenges beyond their grade level and to fully engage with comprehending the story. I can tell they have already improved with just the few weeks they have been using it. The luddite doomers have this completely wrong as this AI drives a love for reading and reinforces comprehension.
The reality is, most 5 year olds don’t get access to the resources most of us have had while growing up. People are saying, “kids should have human tutors.” Guys, most people in the world don’t have any tutors! What Ello has built and other forms of AI-based tutoring is going to raise the average level of education and literacy in the world. Especially in developing countries. Let individual parents decide what’s best for their kids.
I wish I had had this when I was a 5-year-old. Few of my teachers really understood the things I wanted to learn, my peers weren't interested in the nerdy things I was, and my parents certainly didn't have the wealth to provide me with private tutoring. There are a lot of negative comments here, but they are shallow... I'm sure those commenters wouldn't want to live without the access to the Internet, and even a brilliant five-year-old can't use the Internet effectively yet. A smart and curious 5-year-old has endless questions and a properly harnessed LLM has endless patience to provide answers at a level the kind can understand (which usually not even it's parents do).
In fact, this could be one of the most beneficial uses of AI for society yet... private tutors of the level that the mega-rich always had, now for all kids everywhere! This gives me real hope for the future generations of humanity.
What are your thoughts about children in a Sudbury School model? These are democratic schools where children can do what they like in the day. Mostly they choose to play with other kids, games of imagination, though also doing screen time. One of the basic principles is that children figure out what they want to do and the learning comes along with it; the model views adults wanting children to learn something specific as generally counterproductive though having resources available is okay if it is not coupled with any expectations.
Are your devices likely something that they would have fun with and choose to engage with or is it likely to be ignored unless adults use some kind of persuasion to have them use it? Is it cool with a child using it for a bit and then not using it for a few months and then wandering back to it? How far up into math does it go compared to what an a randomly sampled adult could actually do mathwise? Also for reading, are you using phonics or whole word sighting? For math, to what extent is it screen manipulatives versus manipulations of digits? Also, do you have provision for an older child to start learning this stuff so the basics need not be at a 4 year old presentation level, but the concepts still need to be covered?
In Sudbury schools, the typical age of self-taught reading is 7-9 though it can range from 4 to 12. Useful arithmetic usually seems to happen much earlier than reading though reading tends to get completed by the children on their own while arithmetic does not advance further than the needs of money exchange without special effort. In the long run, Sudbury students have no problem with college level material, including mathematics, but it could be nice to have something that eases the white knuckling if it does not undermine the child's self-directedness.
Full disclosure: I worked on a small project with Ello / Catalin a few years ago.
At the time of writing, the sentiment in this post is that this is a terrible idea, and that kids need human tutors. The latter is 100% true. But also, you might want to know some facts about the state of children's literacy in the US (Ello is a math and reading tutor):
1. We're in crisis. As of 2025, 40% of fourth graders are reading below basic levels [1].
2. There's a massive teacher shortage. 2025 US state data shows ~400k teacher positions either unfilled or underqualified [2] – over 10% of the workforce.
3. Bloom's 2-sigma shows that 1-1 tutoring delivers outcomes at the 90th percentile of classroom teaching. Early research is finding that AI can deliver some of this benefit [3].
4. This can't always be solved by parents: 54% of US adults have a literacy below a 6th-grade level, and 20% are below 5th-grade level [4].
At Ello, I heard stories of children figuring out they were behind at school, and when given the app, they holed themselves up in their room and used it to get themselves caught up. And then they could read! Can you imagine falling behind at this critical juncture, and being stuck illiterate while your friends grow past you? We're currently setting kids up for lives of shame and deprivation.
My take: this really is a life-changing technology. And we need this problem solved. Democracy doesn't function without an educated populace.
[1] https://www.nagb.gov/news-and-events/news-releases/2025/nati...
[2] https://learningpolicyinstitute.org/product/overview-teacher...
[3] https://www.sciencedirect.com/science/article/pii/S2666920X2...
[4] https://www.thenationalliteracyinstitute.com/2024-2025-liter...
Super curious to hear from the parents here: Honestly, at this point isn't not exposing our kids to AI just setting them up to fail in the future? Like not letting them learn to use the internet? I have friends who are actually teaching their kids how to use AI because they don't want them to fall behind
This is so cool!
Ignore the haters, AI accelerated education is so obviously a gigantic win for everyone. (And massively levels the playing field.)
I'm a mom who actually has kids and this thread is insane. 'Just get a tutor'...okay?? Are you paying for it? Because that's not an option for a lot of families. I get that it's more ideal, but the alternative is...nothing? Do you not agree that all kids deserves a chance to read? Are we not seeing the lack of reading proficiency in the majority of American adults nowadays?? Or yall too stuck in your tech bubbles?? There are high school students graduating who cannot do math. This is tech that is actually being used for GOOD here.
Really awesome work! I've been trying to do some of this real time back and forth voice coaching myself and it's no easy feat. Congrats on the progress.
My oldest turns 6 in just over a week and my initial reaction to this heading - as well as the product itself and the picture of the kid using it - was heartbreak and sadness. Not anger, just sadness. Like when you read a story about a kid that's a victim of a crime.
Stepping back, I can look at it somewhat objectively and see that there are both kids that need something like this and that it's probably a better solution to the "dumb" homework apps that the kids use for 20 mins a week at this age, but I don't think "Ello deprives 5 year olds of human contact" is the message you should be putting out into the world.
Please don't. Don't deprive children of the interaction with other human beings. 5 year olds don't need tutors. They need play, touch, sense, feel, run, breath, sky, earth.
Pretty interesting. Hopefully this ends up being an affordable solution for without the means for hiring a human tutor.
What is being taught to 5 year olds? And why would an AI tutor be better than an pre-k learning app
Most students are pretty homogeneous in learning at that stage
Dear God no. Keep kids away from AI, and keep AI away from kids. Kids need more human contact, not less.
The more I think about it, the more I want to ban your entire business model
It's bad enough that schools give 5-year-olds tablets to do their maths work on.
Let's not expose them to AI brainrot now too.
This sounds like a terrible idea. 5 years olds need human interaction with a human tutor or with other children.
Is your hallucination rate 0.00000000? If not, then it doesn't deserve to be used.
Modern AI needs to go away. You're not helping by making something that will be grossly misused once it's out of your hands.
oh boy, who validates that the blackbox of bullshit is spewing valid information and not the typical nonsense ...?
stop. children need humans not AI. i hate this.
> Effective teaching isn't just about answering a child's question quickly, rather making the right move at the right moment. AI is also going to be an integral part shaping how this generation of kids learn to read and think, tackling this responsibly means getting the design right.
Can you elaborate on what the experience is like for the child? How does this system help them learn? The article focuses on optimizing for interactivity and engagement, but doesn't discuss how this system challenges or facilitates learning and why AI needs to be the solution.