jeffdean.bsky.social
Jeff Dean
@jeffdean.bsky.social
9.4K followers 3.3K following 140 posts
Google Chief Scientist, Gemini Lead. Opinions stated here are my own, not those of Google. Gemini, TensorFlow, MapReduce, Bigtable, Spanner, ML things, ...
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Aug 29
Honored to be named in TimeAI 100 list, along w/my awesome Google colleagues Josh Woodward & Hartmut Neven & many awesome people.

My recognition is due to collaboration with many great colleagues, so thank you to everyone I've been fortunate to work with over many years! 🙏

time.com/collections/...
time.com
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Aug 27
This model scores very well in the image editing lmarena leaderboard, with a large gap of ~170 points to the next group of models.

lmarena.ai/leaderboard/...
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Aug 27
Our latest Gemini image generation and editing model is quite good. It lets you indulge in a bit of creative fun, helps you make new business cards, etc!

Try it out at gemini.google.com

Blog: blog.google/products/gem...
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Aug 21
Link to detailed paper: services.google.com/fh/files/mis...
services.google.com
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Aug 21
AI efficiency is important. The median Gemini Apps text prompt in May 2025 used 0.24 Wh of energy (<9 seconds of TV watching) & 0.26 mL (~5 drops) of water. Over 12 months, we reduced the energy footprint of a median text prompt 33x, while improving quality:
cloud.google.com/blog/product...
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Reposted by Jeff Dean
kirkhovenkotter.com
Kirk Hovenkotter @kirkhovenkotter.com · Jul 8
The Seattle area runs 14% less bus service today than it did in 2019. The region grew by 3% in that time. We’ve got to get back to running more frequent transit.

That’s going to take more investment from the City, State, & County. Great research from @urbaninstitute.bsky.social & @yonahfreemark.com
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Reposted by Jeff Dean
nafnlaus.bsky.social
Nafnlaus 🇮🇸 🇺🇦 🇬🇪 @nafnlaus.bsky.social · Jun 30
Commonwealth Fusion lands in the ballpark of $2B of new funding from Google, and a purchase agreement for 200MW from ARC (half of the total).

www.youtube.com/watch?v=NjKM...

(For those not following, the base plate in SPARC is installed, and they're nearing the start of magnet integration ).
Google and CFS Announce Strategic 200 MW Fusion Power Deal
YouTube video by Commonwealth Fusion Systems
www.youtube.com
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Jun 28
Thanks for sharing your journey, @moji249.bsky.social! As I said on Twitter, it's really important for people to see that grad school has its ups and downs and that there are real times of struggle. Congratulations on the graduation! 🎉
moji249.bsky.social
Taha @moji249.bsky.social · Jun 28
The elephant in the room. There, I said it.
The Dark Side of Academia: Mental Health, Mentorship, and the Unspoken Struggles of an NLP…
Much unhappiness has come into the world because of bewilderment and things left unsaid.  — Fyodor DostoevskyI entered the Master’s in…
medium.com
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Reposted by Jeff Dean
brenttoderian.bsky.social
Brent Toderian @brenttoderian.bsky.social · Jun 27
PARIS: In the last 20 years, 44ha of Paris car parking has been transformed, making room for wider sidewalks, bikes & buses (15ha), bike racks, EV spots, accessible space, & 2.2K new patios/terraces for outdoor dining. 90% of Paris trips are via walking, biking & transit. V/@villedeparis.bsky.social
Paris before-and-after street transformation Car parking removed between 2003-2023 in Paris
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Reposted by Jeff Dean
dshaywitz.bsky.social
David Shaywitz @dshaywitz.bsky.social · Jun 13
My latest @wsj.com review-delightful new book about the magic and wonder of computers (plus unusual awareness of the ineluctable messiness of biology). www.wsj.com/arts-culture... @dereklowe.bsky.social @nachristakis.bsky.social @scottgottliebmd.bsky.social @thgoetz.bsky.social @ihaque.bsky.social
‘The Magic of Code’ Review: The Book of Binary
To a programmer, code can seem a “domain of sorcery” in which strings of characters have power in the real world.
www.wsj.com
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Jun 10
..., long-distance shared-phrase-dictionary-based communication system ("we won", "send reinforcements", "retreat", ...) using fire and a water tank, first keyboard instrument, and first tic-tac-toe-like game.
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Jeff Dean @jeffdean.bsky.social · Jun 10
Btw, most of the things I mentioned above were from ~third to second century BC. And I didn't even mention the flamethrowers, automated coin-operated vending machine, early cataracts operation tool, atmospheric-pressure-based recurring fountain,...
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Jun 10
Plus early cryptography cipher machines, medical instruments, early musical instruments and more.

The guides were awesome and did live demonstrations.
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Jeff Dean @jeffdean.bsky.social · Jun 10
Early water+whistle based timer (up to seven hours) to wake up slumbering philosophy students so they didn't oversleep.

(Someone on X suggested "NapReduce" as a good name 😂)
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Jeff Dean @jeffdean.bsky.social · Jun 10
Early system that computed position of five planets, phase of moon, etc. thousands of years into future using intricate gears
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Jeff Dean @jeffdean.bsky.social · Jun 10
Early long-distance communication system using 5 bits (fire high or low) to encode the 24 Greek letters, one character at a time.
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Jun 10
If you're ever in Athens, I highly recommend the Museum of Ancient Greek Technology!

maps.app.goo.gl/sngwM98ueKkr...

Early humanoid robots to pour water+wine, demonstrations of heat+steam+water weight to "magically" open 500 kg temple doors, armor, ...
(cont)
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · May 6
🙏
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Jeff Dean @jeffdean.bsky.social · May 6
Here's the WebDev leaderboard from web.lmarena.ai/leaderboard
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Jeff Dean @jeffdean.bsky.social · May 6
Explore the capabilities of the updated Gemini 2.5 Pro, now in Preview in AI Studio and Vertex AI, and experimentally in the Gemini app. aistudio.google.com

We look forward to your feedback! 🙏
Google AI Studio
Google AI Studio is the fastest way to start building with Gemini, our next generation family of multimodal generative AI models.
aistudio.google.com
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Jeff Dean @jeffdean.bsky.social · May 6
Here’s a glimpse of what it can do - check out this retro Windows 95-style web app the model can build from a simple prompt.
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Jeff Dean @jeffdean.bsky.social · May 6
Today we’re sharing an early look at our latest Gemini model update for I/O!

Introducing the updated Gemini 2.5 Pro (I/O edition), which ranks #1 on WebDev Arena and surpasses our previous 2.5 Pro model by +147 Elo points. 🏆

blog.google/products/gem...
Build rich, interactive web apps with an updated Gemini 2.5 Pro
Our updated version of Gemini 2.5 Pro has improved capabilities for coding.
blog.google
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jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Apr 23
ITA was acquired by Google and became one of the foundations of Google Flights.

Fun fact: they had one of the largest Lisp codebases in the world.
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Jeff Dean @jeffdean.bsky.social · Apr 23
If you want to know more about how Google Flights works & the complexity of airline constraints & combinatorial combinations, I highly recommend this set of slides by Carl de Marcken (co-founder of ITA software, which underpins of Google Flights).

www.demarcken.org/carl/papers/...
www.demarcken.org
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Reposted by Jeff Dean
vdean.bsky.social
Victoria Dean (she/they) @vdean.bsky.social · Apr 22
Breaking news: I am now an "adult"
jeffdean.bsky.social
Jeff Dean @jeffdean.bsky.social · Apr 20
My wife was cleaning out some drawers and found some childhood art of now-adult @vdean.bsky.social of the two of us with my longtime colleague Sanjay.
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