CTO @ JAPAN AI | Building enterprise AI agents that transform work

🗼 Tokyo | Building from Japan
Joined April 2009
日本でAI起業は難しすぎる。でも面白すぎるし刺激的 受託やSIで終わらず、プロダクトを作る。モデルから顧客価値までできるだけつなぐ、一番安全なharness、Agent OS、企業のAI基盤。 一緒に作りたい人、早くAIネイティブな新人類になりたい人、野心のある人、大歓迎。DMください。英語でもOK。
📢 プレスリリース AIを全社の業務に定着させる大型アップデート「JAPAN AI 3.0」の提供を開始  japan-ai.co.jp/news/press/20… 作成したAIをアプリ化して提供する「STUDIO App」、AIモデルを最適化する「JAI Auto」搭載! #japanai
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AI startups in Japan are way too hard, and way too thrilling. We build product, beyond outsourcing/SI: the safest harness, agent OS and enterprise AI platform, from model to customer value as far as we can. Ambitious, want to build this and go AI-native early? DM me. JP/EN OK!
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Lan (@JAI CTO) retweeted
ひとつのプロダクトを、数百の現場で鍛える。 製造・製薬・公共・建設の会社の中で、AI に仕事をやり切らせる製品をつくっています。 Agent Harness、Evaluation、FDE、Product Manager、Product Operations の5職種を募集中! page.japan-ai.app/p/5riP6EWE…
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HR manager today: "The AI agent forgot to send the party invites to the new hires." (It was a kanji-to-email matching bug 🤦‍♂️)
Seeing our most analog HR guy dogfooding our product and blaming the AI like a pro. We've officially made it lol
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Lan (@JAI CTO) retweeted
This is a false equivalence. Everyone has the right to keep their code private. The problem is when someone tries to stop OTHERS from open sourcing.
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GLM tops our AI prediction league. We ship all 7 models on JAI, so technically we've never lost a match lol
// Xを放置してたのはJAIを作るのに忙しかったからです(言い訳😓) 息抜きにエージェントがStudioで作ったページ→7つのAIがW杯全試合を予想、毎日自動採点。人間のコードは0行 執筆時点の首位はGLM。抜かれてたらそれも含めてライブです app.japan-ai.co.jp/promo/pag…
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Lan (@JAI CTO) retweeted
時間軸おかしいけど、今さらながら #AIE2026_findy の時の資料を放流~~ 来ていただいた方ありがとうございました 🙌 さて、次のイベントは、来月の AI DevEx Conference 2026 speakerdeck.com/japan_ai/ai-… #AIE2026_findy
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a chat happened in the JAI team tonight
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my most used skills in CC/Codex over the past month
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JAPANAIがシリーズCの資金調達のファーストクローズをしました。前回ラウンドから前年比で約500パーセント成長を継続中で、JAPANAIは設立3年目の今回のラウンドで時価総額は既にジーニーを超えております。日本企業にとって最も良きAI変革パートナーとなれるよう精進を続けていきます japan-ai.co.jp/news/press/20…
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AI made code cheap. It didn't make judgment cheap. Talk is cheap, code is cheap — show me the judgment.
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If we define every step, we become the bottleneck — and sometimes the ceiling.
The higher-leverage work is evals, feedback loops, and making agents explain their work in forms we can inspect and challenge.
Maybe engineers will need training time like athletes: not to compete with AI, but to keep our own intuition sharp enough to keep up.
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I really didn't expect we could pull together 25 high-quality advent calendar blog posts !!
【アドベントカレンダー25日目🎄】 最終日はCTOのLanさんによるJAPAN AIの1年の総括です! 激動の時代の中で、"JAPAN AI STUDIO"という新たなプロダクトをリリースし、 多くのエンジニアが加わった開発組織。 大きく成長したJAPAN AIが、これから先どこを目指していくか、ぜひご一読ください👀 engineering.japan-ai.co.jp/2… #アドベントカレンダー
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Lan (@JAI CTO) retweeted
【アドベントカレンダー2日目⛄️】 JAPAN AI STUDIOのバックエンドに携わるayanさんにインタビュー🎙️ 開発の裏側や、組織文化にいついて感じていることを伺いました。 engineering.japan-ai.co.jp/a…
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Lan (@JAI CTO) retweeted
アドベントカレンダー始めました📅 今日からクリスマスまでの25日間、開発チームで毎日ブログを更新していきます🎁 1日目はEMの東さん(@hgs_japan_ai)に実践的なMCPツールの作成について寄稿いただきました👇 engineering.japan-ai.co.jp/a… 明日の投稿もお楽しみに!
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Lan (@JAI CTO) retweeted
Sharing an interesting recent conversation on AI's impact on the economy. AI has been compared to various historical precedents: electricity, industrial revolution, etc., I think the strongest analogy is that of AI as a new computing paradigm (Software 2.0) because both are fundamentally about the automation of digital information processing. If you were to forecast the impact of computing on the job market in ~1980s, the most predictive feature of a task/job you'd look at is to what extent the algorithm of it is fixed, i.e. are you just mechanically transforming information according to rote, easy to specify rules (e.g. typing, bookkeeping, human calculators, etc.)? Back then, this was the class of programs that the computing capability of that era allowed us to write (by hand, manually). With AI now, we are able to write new programs that we could never hope to write by hand before. We do it by specifying objectives (e.g. classification accuracy, reward functions), and we search the program space via gradient descent to find neural networks that work well against that objective. This is my Software 2.0 blog post from a while ago. In this new programming paradigm then, the new most predictive feature to look at is verifiability. If a task/job is verifiable, then it is optimizable directly or via reinforcement learning, and a neural net can be trained to work extremely well. It's about to what extent an AI can "practice" something. The environment has to be resettable (you can start a new attempt), efficient (a lot attempts can be made), and rewardable (there is some automated process to reward any specific attempt that was made). The more a task/job is verifiable, the more amenable it is to automation in the new programming paradigm. If it is not verifiable, it has to fall out from neural net magic of generalization fingers crossed, or via weaker means like imitation. This is what's driving the "jagged" frontier of progress in LLMs. Tasks that are verifiable progress rapidly, including possibly beyond the ability of top experts (e.g. math, code, amount of time spent watching videos, anything that looks like puzzles with correct answers), while many others lag by comparison (creative, strategic, tasks that combine real-world knowledge, state, context and common sense). Software 1.0 easily automates what you can specify. Software 2.0 easily automates what you can verify.
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What's perfect? Perfect is doing our best within the time and budget we have.
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Lan (@JAI CTO) retweeted
You've seen these paintings a million times. But never like this. Using nano-banana, Seedance, and Kling, I brought them into our modern world, creating an unlikely romance in Central Park, New York City. Enjoy:
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