Jon Felske

Helping people make better decisions everyday.

[Diogo Almeida @CompleteSkeptic]

After co-inventing ChatGPT, I kept asking myself: why have superhuman chat models not led to AGI?

I’ve spent the last 2 years in stealth building a new way to train models (RLCD), and a new type of frontier AI model that we are releasing today: Jev

• 20-200x faster
• 40-400x cheaper (w/ output tokens free)
• Frontier composable intelligence optimized for decisions

AFAICT the shortest path to AI-based economic revolution

[chuplung @choopyplug1]

Google's team just dropped a 9-page PDF on Harness Engineering - one formula replaced prompt engineering:

the twist: same Claude Sonnet, same benchmark - change only the harness

the formula: Agent = Model + Harness

here's the playbook in 6 steps:

step 1 → add guides - AGENTS.md, rule files, constraint docs - each line is a past agent failure turned into a permanent fix

step 2 → add sensors - linters, tests, validation scripts the agent runs on its own output before a human sees it

step 3 → build the agentic loop - plan, execute, verify, fix - bounded retries, budget caps, escalation when stuck

step 4 → externalize memory - the model forgets every session. the harness remembers state, decisions, and artifacts across all of them

step 5 → enforce permissions - which tools, how many writes, what needs approval. the model doesn't enforce safety. the harness does

step 6 → wire observability - track every tool call, cost, retry. trip wires fire when behavior drifts

the result: your agent stops being a demo and starts being infrastructure - every failure makes the system permanently better, not just the next conversation

this 9-page PDF is what comes after prompt engineering and context engineering

bookmark and build the full system from the article below ↓

[Jon Felske @jonfelske]

@chamath https://t.co/9uz56pp8ld

[Jon Felske @jonfelske]

This will be interesting to see if a third party can form. There is definitely room in the middle,

[Elon Musk @elonmusk]

By a factor of 2 to 1, you want a new political party and you shall have it!

When it comes to bankrupting our country with waste & graft, we live in a one-party system, not a democracy.

Today, the America Party is formed to give you back your freedom.

[Elon Musk @elonmusk]

By a factor of 2 to 1, you want a new political party and you shall have it!

When it comes to bankrupting our country with waste & graft, we live in a one-party system, not a democracy.

Today, the America Party is formed to give you back your freedom.

[Sam Altman @sama]

recently the NYT asked a court to force us to not delete any user chats. we think this was an inappropriate request that sets a bad precedent.

we are appealing the decision.

we will fight any demand that compromises our users' privacy; this is a core principle.

[tobi lutke @tobi]

Courtyards are magical

[Ray Dalio @RayDalio]

https://t.co/3axXP2mPHg

[Jon Felske @jonfelske]

@RobImbeault @esthercrawford lol and that was just one re-org ago. Now it’s mysterious and magical!

[Michael Saylor @saylor]

SAB 121 has been rescinded, allowing banks to custody Bitcoin. 🚀

[Chamath Palihapitiya @chamath]

This needs to be fixed or it will end in disaster.

Why?

Average Americans buy S&P 500 index ETFs, in part, because Buffett told them to. They were told they would pay very little and get diversification in the 500 best companies on earth to ride out storms.

But as concentrations rise in a very small percentage of those stocks, the risks don’t fall. They rise. If the indices don’t cap the max percentage of any one stock, you essentially are holding a direct bet on that ONE company. In this case, see that when you buy an index of 500 companies, you’re really buying 10 companies with 490 others thrown in.

If there is any market volatility, the lack of diversification could cause massive impairment.

That’s ok if you’re a “professional” and that’s what you are betting on but most ETF buyers aren’t professional stock traders and they will be in for a rude awakening if this isn’t addressed.

[Jack Altman @jaltma]

Vacation with little kids is not a vacation. It's a war of attrition and a test of your love.

[Jon Felske @jonfelske]

And the noble prize goes to AI! 🤖https://t.co/bFf2Zl9h02

[Jon Felske @jonfelske]

Day two threads! @AdaptAgtech love the new brand! https://t.co/DPDo8AQN4W

[Jon Felske @jonfelske]

@joinyellowbrick NVDA

[Google DeepMind @GoogleDeepMind]

Introducing RoboCat, a new AI model designed to operate multiple robots. 🤖

It learns to solve new tasks on different robotic arms with as few as 100 demonstrations - and improves skills from self-generated training data.

Find out more: https://t.co/9YmgKxmiGE

[Jon Felske @jonfelske]

@courtneymmmmmm @davidrodwin @SFMayorsOffice @LondonBreed @SFPD @KTVU @SFCarBreakins #batman Where are the cops?

[Jon Felske @jonfelske]

@offmeta @davidrodwin @SFMayorsOffice @LondonBreed @SFPD @KTVU @SFCarBreakins My friend's car was stolen and an airtag tracker in it. They knew exactly where it was and who took it. Cops wouldn't get it for him. The problem is they aren't enforcing or prosecuting. Not sure why, but clearly we need better leadership.

[Ankur Nagpal @ankurnagpal]

I used to think the tax incentives in real estate were unparalleled

But my mind was just blown after learning about the economics of investing in solar projects 🤯

Probably the best tax saver out there for anyone with a high W-2 or business owner income

Here's how it works:

[Jon Felske @jonfelske]

Life is a marathon,not a sprint, remember to take a moment for yourself.