@speak cofounder/CTO - AI language learning

Joined October 2009
34 Photos and videos
Strongly agree with this K-shaped divergence happening on software teams. It's existentially urgent to move faster here than what many consider reasonable, because a decent-sized gap today will compound into an insurmountable chasm in output and execution speed and quality by the fall. This means your team must simultaneously buy into the vision of what is possible and will be possible soon, while also being in the trenches on a daily basis wrestling with and steering agentic systems that still often make mistakes, overcomplicate things, and don't always do what the user is envisioning. Navigating this takes strong, continuous leadership that's also in the trenches. We're doing a lot at Speak to stay on the cutting edge here as a team - a few examples: - Continually thinking about what we're still doing manually and following that signal to agentify our repos and processes - Retooling our engineering hiring process to explicitly test for agentic engineering skill and mindset - Explicitly trying to build production features while keeping manual code as close to 0% as possible If you're working at a company that isn't all-in, you should leave before it's too late. Accelerate!
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As we all know on X, agentic AI coding crossed a capability threshold at the end of 2025 such that the era of software engineers writing code by hand was over. @speak, we're urgently embracing this fundamental change to the way we develop software. I wrote up a snapshot of what we’re observing and learning, and where we think things are going: speak.com/blog/agentic-engin…

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Andrew Hsu retweeted
Can voice AI actually get you to fluency?💡 Join us LIVE Wednesday at 4PM CST with Andrew Hsu, Co-founder & CTO, @speak — the voice-first AI language tutor that’s hit $100M ARR and 15M downloads. We'll see you here on X soon!📷 #AI #LanguageLearning
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Andrew Hsu retweeted
Thanks @RashiShrivast18 for telling the @speak story! We’re pushing hard to make the world’s best AI language tutor available to everyone. Super excited for the slate of new feature launches coming later this year! Stay tuned. forbes.com/sites/rashishriva…
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10 Sep 2025
House of Hsu
10 Sep 2025
Thrilled to share that I’ve joined @ThriveCapital as a Venture Partner, where I will be helping to build and invest in companies that can push the boundaries of science and technology.  I’ve known many of the Thrive team for years and have always admired their warmth, intellect, optimism, and boundless ambition to be the most meaningful partner to founders across every stage and sector.  My work has been guided by the belief that alpha is always found at the frontier, with AI starting to achieve human-level performance in generating independent work products, robotics transforming the physical world, biotechnology becoming engineerable, and energy abundance within reach…  This is an incredible time to invent and build new companies and I’m excited to get going. I’m grateful for the last few years investing at NFDG across seed to growth. Oh - and @arcinstitute will still be my main gig! My science isn’t going anywhere :)
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7 Aug 2025
Congrats @OpenAI! Some thoughts from testing the new GPT-5 models @speak over the past several weeks: - Significant leap in the reasoning frontier - your strong assumption now should be that it can crush most real-world complex tasks across a giant context window/dump, and if it doesn’t, it’s more than likely that your prompt isn’t good enough or you need to provide more clarity. Your ability to think in a structured manner and write with clarity is the big bottleneck now. - We were the most impressed by GPT-5's pattern recognition and reverse engineering capabilities across giant context dumps. It’s super good at systematically understanding and generalizing from examples to create structured workflows or playbooks. - Example - over the years, we’ve developed a highly opinionated and structured pedagogical methodology for functional language fluency that we call the Speak Method, but have struggled for years to distill and document it into a playbook clearly enough. Gemini 2.5 Pro and o3-pro couldn’t do this, but GPT-5 did an amazing job analyzing a large dump of our curriculum/content and breaking down/generalizing the principles necessary to scale our content. This was really surprising and felt superhuman. - We've found previous reasoning models both slow and inconsistent in their logical leaps. GPT-5 feels far more consistent and accurate on reasoning tasks, which is transformative for our curriculum scaling process and language tutoring capabilities. - Zooming out and speaking as an extremely heavy user of both ChatGPT and the API, I’m super excited (and relieved!) that the constellation of models is going away and everything is getting unified. It’s absurd that the full model is priced ~same as o3/4.1 and 5-mini is 5x cheaper! This day has been coming for a long time, and we expect to switch all of our realtime usecases over with reasoning=minimal. Huge congrats to the OpenAI team and we can’t wait to bring all this to our users this quarter!
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Andrew Hsu retweeted
A special bit of silicon valley is that everyone is willing to help each other. Back in 2015, we pinged @karpathy for AI help and (within 2 min!) he offered to meet up w/ us the next day. One of a few formative convos that led to us doing AI research and starting @speak.
🆕 Personalized AI Language Education, with @adhsu, CTO of @Speak! youtube.com/watch?v=tIVKgztD… For the first time, Andrew tells the story about building the next generation of AI Language Learning, starting pre-Transformers, getting advice from @karpathy, and why they went bet hard on South Korea and on personalized, realtime, conversational fluency as the ultimate language learning goal! "It took much, much longer than we expected to build a great product and find good PMF. The first few years were very painful. And I think without this really compelling vision of the future, we would have quit."
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14 Jul 2025
Thanks for having me on @latentspacepod @swyx!
🆕 Personalized AI Language Education, with @adhsu, CTO of @Speak! youtube.com/watch?v=tIVKgztD… For the first time, Andrew tells the story about building the next generation of AI Language Learning, starting pre-Transformers, getting advice from @karpathy, and why they went bet hard on South Korea and on personalized, realtime, conversational fluency as the ultimate language learning goal! "It took much, much longer than we expected to build a great product and find good PMF. The first few years were very painful. And I think without this really compelling vision of the future, we would have quit."
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9 Jul 2025
Thanks for having me on @ashleevance - was a very fun convo!
Full episode with @adhsu on life as a child prodigy, being one of the first Thiel Fellows and building @speak Timestamps 00:00:00 - Intro 00:03:05 - Started college at twelve 00:05:34 - Homeschooled by immigrant parents 00:08:30 - Three degrees by sixteen 00:19:53 - First Thiel Fellowship class 00:21:07 - Dropping out Stanford PhD 00:25:01 - Why not cure cancer 00:34:47 - Building Speak with AI 00:38:00 - Deep learning winter thawing 00:41:25 - Three failed product launches 00:42:07 - Choosing South Korea market 00:43:03 - Product takes off rocket 00:48:00 - ChatGPT threatens language learning 00:51:15 - OpenAI partnership and investment 00:56:16 - AI completely changes learning
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Andrew Hsu retweeted
The day has finally come! @speak is no longer an English language learning app. You can now learn 🇪🇸 Spanish, 🇫🇷French, 🇯🇵 Japanese, 🇰🇷Korean, and 🇮🇹Italian as well! And I'm not talking about memorizing vocab in a dopamine machine, I'm talking about good old fashioned spoken fluency.
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20 Apr 2025
Spotted @pdhsu at our parents’ house.
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Andrew Hsu retweeted
Fun fact: @speak has 65% brand recognition in South Korea and close to 10% of the population has used us to improve their English fluency. Was great talking to @bquazz on how we got our start there!
19 Mar 2025
Why Korea? What have we learned from building Speak? @connorzwick joined @Accel's @bquazz to dive into AI-driven language learning, Speak's journey & more: accel.com/podcast-episodes/s…
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Andrew Hsu retweeted
📈 @speak
26 Feb 2025
Here's what happened to that startup's revenue graph in the next year (in blue).
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Andrew Hsu retweeted
“We’re really an AI native company." Speak CEO @connorzwick explains how his app uses #AI to get language learners talking! Plus, their growing presence in East Asia, and partnership with @OpenAI's startup fund.
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Andrew Hsu retweeted
10 Dec 2024
These guys were among the earliest of all the startups we've funded to understand what AI was going to make possible, and they have executed perfectly on that early insight.
1/ Excited to announce Speak has raised a $78m Series C from @Accel at a $1b valuation! It' a huge milestone for us and continued validation of our founding idea: AI would fundamentally transform learning. 8 years later, we’re well on our way and believe this more than ever. 🧵
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10 Dec 2024
We've raised a Series C from @Accel valuing Speak at $1b to keep driving toward our mission of reinventing the way people learn, starting with language. This year was great, but we have even bigger plans for 2025 and are hiring exceptional technical talent to work on one of the fastest-growing consumer AI applications. Join us! speak.com/careers

1/ Excited to announce Speak has raised a $78m Series C from @Accel at a $1b valuation! It' a huge milestone for us and continued validation of our founding idea: AI would fundamentally transform learning. 8 years later, we’re well on our way and believe this more than ever. 🧵
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Andrew Hsu retweeted
27 Nov 2024
When I was on a menswear forum, I remember discussing the question of why there are so many bespoke shoemakers in Tokyo. Some said "it's because the Japanese value craftsmanship. They are noble, not like wasteful Westerners." This sort of handwaving feels unsatisfying to me.
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