Zain Rizavi

building: @cimentoai // previous: investing at @ridgevc, @pelion_vp, special projects @cloudflare // curiously dervish

[Zain Rizavi @MrRazzi17]

After months in stealth, my co-founder @helloericsf and I are finally sharing @cimentoai with the world. 🌎

AI changed social engineering. Attacks are now personalized, convincing, and cheap to generate at scale.

[Yang Fan Yun @YangFanYun]

Today we're releasing Composite-Bench: a long-horizon computer-use benchmark with certified-optimal answers and verified compute.

The strongest open-weights model isn't Kimi K3. GLM-5.2 beats it by 32 points and clears every closed model we tested except Claude.

[Zain Rizavi @MrRazzi17]

@bryce congrats man

[Alexis Ohanian 🗽 @alexisohanian]

Want to start a company? Great. Get an appetite for glass. You’re gonna chew it every day.

[Zain Rizavi @MrRazzi17]

@elithrar Porsche lookin clean 🧽

[Cimento AI @cimentoai]

You spent a decade training humans not to click.
Now agents click for them.

Social engineering isn't going away. It's getting a new victim.

Our founder on why the next phishing target isn't human:

[Zain Rizavi @MrRazzi17]

@anaganath 🙏

[Zain Rizavi @MrRazzi17]

we've had engineers turn down Palantir for us from schools nobody in AI is fighting over, like Utah or BYU, which helped build the early internet before GPUs were cool.

Recruit where everyone else does, and you're overpaying for an illusion, not talent.

[Zain Rizavi @MrRazzi17]

https://t.co/UJ0vHrf0Zu

[Zain Rizavi @MrRazzi17]

https://t.co/UJ0vHrf0Zu

[Zain Rizavi @MrRazzi17]

@boxerbk prob outsourced it to Claude

[Bryce Roberts @bryce]

Not needing to raise does not preclude someone from raising in the future from an incredible place of strength.

Call it the Series FU

FU money lets you walk away from anything but the absolute ideal deal.

[Zain Rizavi @MrRazzi17]

acting sanely is the new form of being eccentric

[Zain Rizavi @MrRazzi17]

This is a master class in acquiring and developing 'taste'

https://t.co/3Rf3DftZsy

[Cimento AI @cimentoai]

Click rates are down. Dashboards are green. Employees still get owned.

Our CEO on why single-email phishing tests measure the wrong thing and what measuring human risk from first principles actually looks like:

https://t.co/Dj6XO8CkLs

[Zain Rizavi @MrRazzi17]

@bhalligan So much easier to execute on this while staying small.

[Zain Rizavi @MrRazzi17]

Support tickets are where customer trust goes to die.

We run everything through shared Slack channels instead. Customers message us like teammates, engineers answer directly, and problems die in minutes... Exhibit A from today (one of the leading AI cos):

[Zain Rizavi @MrRazzi17]

speed of reply is one of the most underrated predictors of quality collaboration. It's also very, very satisfying.

[Zain Rizavi @MrRazzi17]

@contextconor @hyperspell @maebert Love to see it!

[Zain Rizavi @MrRazzi17]

@jessemangum Pls do!

[Zain Rizavi @MrRazzi17]

office coming together.. big step up today with the 🇺🇸

[Zain Rizavi @MrRazzi17]

@Chandrika633 Welcome anytime!