Perceptron ML (YC S26)

Backed by Y Combinator.

[Perceptron ML (YC S26) @PerceptronML]

We are excited to launch Perceptron ML (YC S26).

We make law firms AI-native.

Tens of billions in legal work goes unclaimed every year because firms can't move fast enough to take it. We build the AI and software that lets them: intake answered at 2 a.m., demands drafted from the record, deadlines watched, built around how each firm already works. And it doesn't guess. Every fact traces to a real document you can click open.

https://t.co/uj70StegaY

[Perceptron ML (YC S26) @PerceptronML]

@dylanpkel Congrats on the launch!

[dylan @dylanpkel]

Excited to launch Agentmuxer, the OpenRouter for Agent Capabilities.

Agentmuxer gives your agent paid capabilities on demand: web search, scraping, extraction, enrichment, and more. It asks for what it needs, we route to the best provider based on benchmarks and outcome feedback from agents, and it pays per use from one balance. No accounts, keys, or subscriptions.

The future is autonomous acquisition: agents acquiring the software, specialized agents, and skills they need to finish the job, without a human in the loop. We build the benchmarks, evals, and routing that make that possible, getting smarter with every request that runs through the marketplace.

We're looking for early users to try it out with free credits - join that waitlist at https://t.co/z7Ru1i2fWN if you want to check it out!

[Emil Ares @emilares]

Best thing about @ycombinator. Run club with partners. This one w/ @raphaelschaad and top tier founders.

[Raphael Schaad @raphaelschaad]

# Your only job during YC

Demo Day S26 is a month away and we're out here running.

The YC batch is probably the highest leverage three months on a startup journey. For many founders it will even turn out to be the highest leverage time of their lives; it certainly was for me when I went through the W20 batch with my startup Cron.

Our motto at YC is "Make something people want." You know you are doing that if your startup is growing significantly week-over-week. We share a lot of advice with founders how to do that. But if I had to distill the essence of YC advice down to the activities themselves, it’s this:

> Build product; talk to users.

It sounds simple, but it's not easy. While it's two activities, they're two halves of a single loop. First, you need something for people to react to. Just showing up and asking questions is an interview, not true customer discovery. People are more likely to tell you the truth about their problems when showing the wrong thing, than showing nothing. Then you take the learnings, rapidly incorporate them into the latest product iteration, and show it to your users again. Back and forth. Along the way you launch; product meets market, and the loop spins ever faster, until the gears hopefully click.

Done in earnest, this process takes everything out of you as a founder.

You might wonder what this has to do with running. I omitted a third activity that I believe completes a founder's only job:

> Build product; talk to users; and look after yourself.

This is it.

In recent years, PG himself mentioned some version of the third activity. Here it is joined for posterity.

You can only spin the pre-PMF loop as fast as required when at your best. And you're only at your best when you're in good mental and physical shape. However you achieve this, is individual. PG's flavor of it might have involved eating healthy (if you know him, rice and beans, likely). My version of it is running, and that's why I've been taking founders on that weekly run from the YC office.

[louis030195 | screenpipe (YC S26) @louis030195]

@OpenAI if you want the open source version (21k stars), local, any harness, any model, macos, windows, linux and enterprise: @screenpipe :)

(also works inside of codex and claude)

[Vivian Midha Shen @vivianmshen]

an IOI 2x gold medalist, a Navy explosive ordnance officer, and a 17 y/o intern at Coinbase walked into Chase Center last weekend...

...and I interviewed all of them.

I found 12 of the most ambitious builders and founders at YC Startup School, out of over 6,000 people.

from all over the world, all with the same energy: earnest, creative, resourceful - including one who built a rocket out of salad bowls.

PS: you can still apply late to YC F26.

00:00 — Intro
00:28 — Meet the founders and builders
02:01 — What they’re building
09:17 — Should you go to college?
10:46 — Why they started
11:58 — Advice and what’s next

[Perceptron ML (YC S26) @PerceptronML]

Launching Notyfi (YC S26), track anything you want happening in the world. Start for free.

We watch the internet and feed the context to you or your agents, by email or webhook, queryable via API or MCP. Instantly, hourly, daily, or weekly.

Start free: https://t.co/7anJjetpTR

[Chris @Gramscki]

When YC says we take people from all over, you dont have to live in San Fran. Well here are the majority of the summer 2026 companies.

[0noise @0noisee]

Perceptron ML joins Y Combinator Summer 2026 to build event-driven AI

[Ted | unfair.so @notmiramurati]

I analyzed the full Y Combinator S26 batch of 53 startups

Used https://t.co/V4Ygdq99TF to identify the audiences paying for them

These startups prove which markets deserve capital. If you’re building and still don’t know how to onboard your audience, this post is for you ↓

AI-agent & LLM builders. The single biggest audience. Tools for people shipping agents, automation, and AI apps: @explabsai, @MireyeHQ, @inkbox_ai, @markov__ai, @machine__0, @UseBylaw, @TouchmarkAI, @getcontextdev, @archal_labs, @try_glen, @keyserfaty (Agentcard)

Early-stage founders & startup operators. Tools to build, staff, and scale small teams: @coastyai, @talentpluto, @tryinstance, @getprescience, @shauryaagg (Florin), @formerlypeter (Florin), @philipxmeng (Shepherd)

Enterprise finance & revenue ops. CFO stack, AR/AP, RevOps, and support operations: @rexdotinc, @useprized, @Pango_ai, @merlinkafka (Rex)

Legal, compliance & risk. Legal ops, compliance, and risk review: @PerceptronML, @abe_yebe (Osmaura), @rookunderfire (Osmaura)

Healthcare & clinical operations. Clinics, practices, and care: @jackbeecher23 (Denta), @mchenofficial (Care GP), @anshtdn (Cova)

Industrial, manufacturing & process plants. Plants, controls, heavy industry: @alexytung (Whitespace), @warrren_shepard (Control Seat)

Deep-tech, VC & investment research. Funds, diligence, and research: @latolabs_io, @ParasmaAI, @os3robotics

Education & K-12. Schools, teachers, curriculum: @hursheybar2 (Edviro), @kstanuj (Edviro), @alexsouthmayd (Bloomy)

(audiences mapped with @meleaai)

Comment “yc” and I’ll send you the full table of startups and their audiences