Grey Baker

Visiting Partner at @ycombinator.

Previously co-founder of @pincitesai (acq. by @filevine) and @dependabot (acq. by @github). Employee #3 at @gocardless.

[Garry Tan @garrytan]

Want to try GStack /office-hours for your product idea as quickly as possible? It's one click here:

https://t.co/8g3LJkrV6i

[Parth Radia @parthnradia]

https://t.co/NMHB1Q2lv9

[Grey Baker @greybaker]

The appetite for AI in consumer sales and customer support is so strong that the best early stage startups are already able to close deals with Fortune 500 companies

[Y Combinator @ycombinator]

Cignara (@cignara_ai) automates sales and customer support for large B2C enterprises across voice + chat. Its AI agents go beyond FAQs to resolve issues, execute governed policy-bound actions, and surface retention and growth moments.

Congrats on the launch, @nalingupta01!

https://t.co/JpgRx5cDs3

[Vivian Midha Shen @vivianmshen]

It’s the last day to apply for the YC S26 batch.

Applying to YC is a rite of passage for pilgrims on the startup journey.

I applied to YC 2x before I got in. Each time, my application got better.

You never know where it’s going to take you.

https://t.co/BzYXBctqM4

[Y Combinator @ycombinator]

Every company is racing to adopt AI, but many don't know where to start – let alone how to do it at scale. @HessianHQ forward deploys into your business to map the work, then builds, operates and scales AI agents on their platform to get the job done.

Congrats on the launch, @bao__nguyen, @thomasedwatson, and @__jdsmith!

https://t.co/Tum3bFbgSU

[Y Combinator @ycombinator]

Juno (@junocompanion) is the AI personal health assistant for the 1B+ people living with chronic illness.

Founders @isaactolley_ & @marshalljgould both grew up with chronic conditions and spent years waiting for answers.

6 months in, Juno now supports 80,000+ people globally.

https://t.co/AgqOhLWZ9W

[Y Combinator @ycombinator]

Banks can't tell which human is actually operating an account. @Incandor_ai links behavior across your user base, making fraud rings, mule handoffs, and banned operators visible.

Congrats on the launch, @Matthew_Yekell & @RosenzweigLuc!

https://t.co/Bk7Q3X8N3G

[Grey Baker @greybaker]

The future of software development is going to be teams collaborating with agents. Lightsprint are building the platform where it will happen

[Y Combinator @ycombinator]

Lightsprint (@lightsprintai) is a collaborative platform that helps teams plan visually, manage cloud agents in parallel, preview changes live and ship product reliably.

Congrats on the launch, @benversel, @HengHongLee, and @bencxr!

https://t.co/UciYZ309eu

[Grey Baker @greybaker]

Pathologists use software from the 90s because high switching costs let their suppliers get lazy. That's about to change. Voice and agentic workflows have increased the feature gap while AI has reduced the switching costs.

Prepare to see a lot of legacy software get swept away.

[Y Combinator @ycombinator]

Voquill helps pathologists write case reports faster.

Many pathologists spend more time writing reports than diagnosing. Voquill listens as they work and drafts a sign-out-ready report in real time.

Congrats on the launch, @HenryHabibAI, @josiahsrc, and Michael!

https://t.co/ZrKsAX7MnT

[Grey Baker @greybaker]

Learning to make a game used to take years. Pops lets anyone do it in minutes. The future is going to be fun!

[Y Combinator @ycombinator]

Pops (@pops_fyi) lets anyone create and play AI games.

Describe your idea, and Pops turns it into a fun mini game to remix, share, and play with friends. No code required. All you need is an idea. Short-form software.

Congrats on the launch, @alonzuman!

https://t.co/aZbGgl5Smv

[Adam Cohen @adambcohen93]

Weave is launching the number 1 prompt router in the world. It enables you to get 70% more efficient use of your tokens.

We analyzed millions of prompts and found that the vast majority don't need a frontier model.

Weave Router fixes that. It analyzes your prompt and routes it to the highest quality model with the lowest cost (across open and closed source models).

This all happens in your current workflow on Claude, Cursor or Codex so you don't have to change a thing.

Early customers have seen an ~70% reduction in costs without any slowdowns.

Source code available.

[Tyler Bosmeny @bosmeny]

A mic drop moment @ycombinator tonight

@sama just offered $2M in OpenAI tokens to EVERY YC startup in the current batch in exchange for equity

Just like Yuri Milner offering to invest in every startup back when Sam was a YC partner

I can't wait to see what's unlocked when you let the most driven, creative and formidable founders tokenmaxx

[Y Combinator @ycombinator]

Memory Store (@memorydotstore) gives your team and AI agents a shared company brain.

Your team's knowledge & decisions are scattered across slack, emails, and people's heads. Memory Store turns them into a living wiki for your agents and teammates.

Congrats on the launch, @ishitajindal17 & @diwanksingh!

https://t.co/xWrsKiVGrP

[Y Combinator @ycombinator]

Prism is an AI-native recruiting agency.

Tell Prism who to hire, and they find, engage, and deliver candidates ready to interview. Their people search scores 21+ points clear of published competitors on the leading industry benchmark.

Congrats on the launch, @theokitsberg & @AxelLaPira1!

https://t.co/1lxz9ajhwv

[Grey Baker @greybaker]

Transload use spatial AI to make a warehouse’s CCTV cameras 10x more valuable, starting with measuring freight

[Y Combinator @ycombinator]

Transload (@transloadAI) measures freight with security cameras.

Shippers routinely misreport dimensions, costing logistics companies a fortune. Transload captures sizes in-motion, using only the CCTV already installed.

Congrats on the launch, @juliusscheel, @nilsboern, and @jagowahl!

https://t.co/Gz8Q3Cc9z3

[Y Combinator @ycombinator]

The $2T telecom industry was built for humans. @AgentPhoneHQ is rebuilding it for agents. One API gives every AI agent its own phone number and a trusted identity to reach the real world.

Congrats on the launch, @themeetmodi & @manav2modi!

https://t.co/WIUIJbAzI5

[Y Combinator @ycombinator]

Astraea brings drugs to market faster by fully automating clinical trial biometrics, turning raw study data into CDISC-compliant datasets, TFLs, and FDA-ready outputs in days.

Congrats on the launch, @joshwqngsr and Sanmay!

https://t.co/0prLcgOdwd

[Y Combinator @ycombinator]

Auxos (@UseAuxos) lets marketing, product, and research teams simulate every decision at scale before it reaches a real customer. Test hypotheses on messaging, ads, pricing, and brand positioning in minutes.

Congrats on the launch, @TheAshtonDaniel, @kerry_lu_, and @jwoobers!

https://t.co/iGq91eXOFq

[Y Combinator @ycombinator]

Clara (@askclarahealth) is an AI-powered primary care doctor that reads your whole medical history, diagnoses, and treats - with licensed clinicians reviewing every decision. From the team that built Circle Medical to nearly 1 million visits/year.

Congrats on the launch, @georgefavvas, Zeeshan, and Caitlin!

https://t.co/s5QnzMg8w6

[Y Combinator @ycombinator]

PerfectBit (@PerfectbitAI) creates high-quality training data that's correct by construction.

They verify against physics simulators, scientific databases, formal proof systems. LLMs, robotics, AI for Science, and more.

Congrats on the launch, @vaphab and @sjy82155065!

https://t.co/UN0LlQYIwD