We build red-teaming agents that help developers fix their RL environments and improve their agents. Our customers are tired of being bullshitted by their agents.
Fulcrum is a Y Combinator company in the Summer 2025 batch. Its directory entry describes it as: The agentic debugger for AI systems. The founders listed are Kaivalya Hariharan (Founder/CEO), Uzay Girit (Founder/CTO) (Y Combinator directory entry, August 30, 2025).
Sell to companies like Fulcrum? Enter your website and see 10 with a filed reason to buy from you this month. Free.
Opens in a new tab. No signup.
New accelerator entry · 2025-08-30 · the record
Pitching, partnering or investing alongside them? See who really runs and owns Fulcrum.
Free to see. No signup.
More on Fulcrum and the records around it.
Get an email when Fulcrum changes status, grows its team or files a funding notice. One email first to confirm; nothing else until you click it. At most one a day, one click to stop. Free for up to 3 companies.
We'll show it in your MentionFox inbox when Fulcrum raises, hires or launches. No email unless you switch it on.
Watch Fulcrum →Get the full cited report on Fulcrum
Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
A Full Report on Fulcrum: verified, sourced, every claim cited, ready in a few minutes. See pricing.
Saved here on this device in the meantime, so nothing is lost either way.
We build red-teaming agents that help developers fix their RL environments and improve their agents. Our customers are tired of being bullshitted by their agents.
Checked away from the directory entry. Neither line below comes from the company's Y Combinator page.
Scaling human intent in software
The title and description the site itself served, answering 200, after redirecting from https://fulcrumresearch.ai. Not a cached copy and not the company's directory entry — what was live when we asked.
Counted only where a thread links to this company's own site, announces it by name on that forum, or names it beside its own Y Combinator batch. A thread whose title merely carries the words is not counted — a name is not an identifier. Hacker News is not us, and nothing above is our opinion of the company.
MIT CS & Math ’24. MEng AI candidate under Jacob Andreas (LINGO) group. Best Paper—NeurIPS ML Safety ’22; follow-up at NeurIPS ’23 and benchmark paper accepted to NeurIPS ’24. Emergent Ventures Fellow ’25. Founder of MAIA (MIT AI Alignment). Research stints at Redwood Research and Truthful AI. USABO Nationals finalist (camper), two-time AIME qualifier.
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
A Full Report on Fulcrum: verified, sourced, every claim cited, ready in a few minutes. See pricing.
What the Full Report on Fulcrum covers
Plus the sections for what you are deciding, which you pick after ordering.
A real finished report, first screen. Opens in a new tab.
Not ready to order yet? Keep this snapshot.
Sends this preview to you once; we won't add you to any list
You land back on this company when you are in.
Not ready to upgrade? Keep this one in view instead.
Watchlist FulcrumYou get an alert in MentionFox the next time this company shows up.
If you're behind Fulcrum: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. GetFoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.
Sourced from the company's Y Combinator directory entry, from the company's own site, read directly on 2026-09-27 (fulcrum.inc), and from Hacker News, where 4 threads met the matching rule stated beside the count.
Each opens in a new tab, filled in for Fulcrum. With no account yet, you sign up free and land on the result.
Share the news. Sharing needs no account.
https://mentionfox.com/funding/yc-fulcrum