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Boris Cherny x.com
Fable 5.1 is our best model yet for coding, data analysis, computer use, design, presentations, Tag, and the hardest long-running agentic work. This model is a pleasure to work with, and I've been using it for everything.
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20 September
12 September
11 September
1 September
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Their words
Using time for this sounds boring, but time synchronization is unironically one of the most complicated things in computing.
26 August
19 August
12 August
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korrents.com
We cannot say what a junior engineer is worth because we cannot say what any engineer is worth; it is all vibes.Their words
The hardest thing about quantifying the value of junior engineers is that we don't know how to quantify the value of any engineer. So it's all vibes.
10 August
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Second of all is I hope you worked on your personal brand and on visibility because in this day and age there's so much noise out there that your hardest problem is not the tech, it's not the software, not even the people. The hardest problem now is like getting eyeballs.
9 July
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you've got these other generalists doing design, you've got engineers doing design, product staff doing design, but I'm actually pretty long on design or designers because they tend to have taste and I think that is something that is much more difficult to imagine being automated away.
16 June
4 June
From one piece Do the hardest thing 3 beliefs, in the piece's order there
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Their words
Your hardest idea is often your best idea, the one with the most potential.
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korrents.com
The most valuable problem to pursue is the hardest one someone is genuinely positioned to solve.Their words
Doing "the hard thing" means pursuing the highest-value problem you can find that still sits inside your zone of expertise; the hardest problem you're personally in a position to win.
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korrents.com
Building the hardest feature in a product yields disproportionately greater returns than easier ones.Their words
Choosing to tackle "the hardest feature" generally produces power-law-level returns, as opposed to tackling something less hard.
3 June
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korrents.com
The hardest problem a company full of brilliant engineers has is not how to build something — it is what to build.Their words
So you have a lot of smart Googlers. These people are brilliant. I mean extremely brilliant to the point where the hardest problem Google had in my opinion was what to build. Not how to build it, what to build.
25 April
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korrents.com
Decision markets are the idea of mine with the biggest expected impact, though not the deepestTheir words
It’s not my deepest, grandest, beautiful, or hardest won insight, just the one with the biggest expected impact.
6 April
1 April
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that was the most brilliant thing because by doing the hardest thing first once you launch that everything else is downhill from there
26 March
20 March
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Um so yeah, the the the um the core of what I do, like actually solving um the most difficult part of of a math problem, that hasn't changed too much. I still use pen and paper for that.
13 February
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One is at every moment of this exponential, the extent to which the world outside it didn't understand it. This is This is a bias that's often present in history where anything that actually happened looks inevitable in retrospect.
9 February
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Simply making fossil fuels more expensive without having affordable alternatives just makes energy more expensive, which hits the poorest hardest.
Do subsidies make meat much cheaper?hannahritchie.substack.com
1 January
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We do more work with AI. I'm working the hardest I've ever worked.
22 November 2025
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