Y Combinator
@ycombinator
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We help founders make something people want. Subscribe to our newsletter: https://t.co/sjqjxxBeLc
San Francisco, CA
Joined February 2010
In just a few years, James Hawkins (@james406) took PostHog from an idea hacked together right before YC's W20 deadline to a unicorn powering product analytics for thousands of teams. He joins YC's @bradflora to talk about surviving six months of "pivot hell," why open-source
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You have 100+ tabs open and your brain is fried. Introducing Dex, your second brain in Chrome that organizes, remembers, and takes action for you. Turn tabs into to-dos, multitask with agents, find and save anything for later. All without leaving your tab. As a founder, it's
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Introducing Video → UI in @magicpatterns, now available to everyone. Animate interactions, generate full user flows, debug issues, all from just uploading a single file. Here are some insane examples of how prompting just got 10x easier:
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Over the last few months, @diodeinc has been working with @anthropic on a shared question: how good can a general-purpose AI model become at real electrical engineering work? Not as a demo or a toy, but on designs that become hardware that their customers plug into test stands,
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We're building HyperbookLM. The open-source NotebookLM with a web agent, powered by https://t.co/juHqaNu5KH & GPT-5.2 Drop URLs. It browses. It reads. It remembers. - Ask questions across all your sources - Generate audio summaries you can listen to - Create structured mind
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BrowserBook (@browserbook_ide) is the IDE for writing reliable web automations. TypeScript notebooks, an inline browser, a context-aware AI assistant, and easy API execution - all in one place. A practical alternative to unreliable browser agents. https://t.co/WeXoPpbrJ0
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Head of Design @ryolu_ helped transform Cursor from a feature-layer on top of VS Code into one of the world's leading AI code editors. He joins YC's @aaron_epstein on Design Review to talk about the path that brought him to Cursor, how rapid prototyping reshaped the core
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A glimpse of what we’ve been quietly deploying across the majority of U.S. states this year. Still wild to see robots operating day after day, night after night. Follow me for behind-the-scenes progress as we scale physical AI in the real world.
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"Make something people want" is the destination, but "Be relentlessly resourceful" is how you get there. https://t.co/5jxokRXcWg
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November was a busy month across Terran R test campaigns. 🛢️ Second stage tank successfully completed acceptance testing with 30+ load cases, including pressure proofing and flight-load simulations. 💨 Transonic and supersonic wind tunnel testing wrapped with 100+ runs of the
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Another big win for the Y Combinator ecosystem in India - delivered by an exceptional Indian e-commerce company :)
Meesho goes public today, becoming YC's second company to list in India. From S16 to IPO, they've built India's largest e-commerce platform—empowering millions of small merchants to grow their businesses. Congrats to @viditaatrey and @barnwalSanjeev on a decade of relentless
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A year ago, we verified a preview of an unreleased version of @OpenAI o3 (High) that scored 88% on ARC-AGI-1 at est. $4.5k/task Today, we’ve verified a new GPT-5.2 Pro (X-High) SOTA score of 90.5% at $11.64/task This represents a ~390X efficiency improvement in one year
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🚀New cookbook: Gemini 3 + Mem0 MCP We put together a step-by-step guide showing how to add Mem0’s persistent, structured memory to a Gemini 3 workflow using the Model Context Protocol. If you're building agents that need long-term recall, consistent context, and reliable
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"If you want to build a website, use Lovable. But if you want to build robust internal applications, use Vybe." Couldn’t sum it up better, Vybe is nailing the next generation of internal tools! Huge congrats to @qhoang09, @Fabien_Devos and the whole @vybe_build team for this
Today we’re launching Vybe to the world and announcing our $10M Seed round to make vibe-coding actually work inside companies. This is why, how and our vision: Over the last few decades, every fast-growing company has quietly built the same mess behind the scenes: internal ops
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Huge congratulations to @hirokitakeuchi and the team. I first met Matt and Hiroki in December 2010 to talk about a payments idea. Hiroki still at the helm 15 years later. What a run 🫡
🎉BIG NEWS We’re excited to announce that Mollie, one of Europe's fastest-growing financial service providers, has signed an agreement to acquire GoCardless. ➡️Read more here: https://t.co/krg6uFGpZz
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Kenobi (@KenobiAI) lets your website personalize itself to every visitor. Sites using Kenobi see 3x engagement and 2x conversions. All you need is a single script tag. Congrats on the launch, @ChrisMjelde & @rorzio! https://t.co/H6bESh5Nfh
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Astranis today builds more commercial GEO satellites than the rest of the industry combined. But we're not stopping there. We believe it’s critical that we bring back manufacturing to America and rebuild our industrial base. Especially in aerospace and defense. That’s why we
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You can now train LLMs 3× faster with no accuracy loss, via our new RoPE and MLP kernels. Our Triton kernels plus smart auto packing delivers ~3× faster training & 30% less VRAM vs optimized FA3 setups. Train Qwen3-4B 3x faster on just 3.9GB VRAM. Blog: https://t.co/j3HpsmzrCw
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15 years ago: Google intern Today: Google's AI Futures Fund invests in @emergentlabs It feels surreal to see life come full circle!
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