Jeff Dean
@jeffdean.bsky.social
Google Chief Scientist, Gemini Lead. Opinions stated here are my own, not those of Google. Gemini, TensorFlow, MapReduce, Bigtable, Spanner, ML things, ...
Reposted by Jeff Dean
Three Members of Congress showed up to inspect the actions of federal officers in their state and the federal officers drew their weapons?
JUST NOW: Huge mass of agents in a standoff, weapons drawn as Reps. Ilhan Omar, Angie Craig, and Kelly Morrison attempt to conduct congressional oversight at the Whipple Building, which has been HQ for thousands of ICE agents.
@zeteo.com
@zeteo.com
January 10, 2026 at 4:26 PM
Three Members of Congress showed up to inspect the actions of federal officers in their state and the federal officers drew their weapons?
Reposted by Jeff Dean
A WSJ visual investigation found that the Minneapolis ICE killing is one of 13 incidents where federal immigration agents have used deadly force against civilians in vehicles since July
www.wsj.com/us-news/vide...
www.wsj.com/us-news/vide...
Videos Show How ICE Vehicle Stops Can Escalate to Shootings
A WSJ visual investigation found that the Minneapolis ICE killing is one of 13 incidents where federal immigration agents have used deadly force against civilians in vehicles since July.
www.wsj.com
January 10, 2026 at 4:09 PM
A WSJ visual investigation found that the Minneapolis ICE killing is one of 13 incidents where federal immigration agents have used deadly force against civilians in vehicles since July
www.wsj.com/us-news/vide...
www.wsj.com/us-news/vide...
Reposted by Jeff Dean
I think it is probably a bad idea to put clearly unhinged, angry psychopaths in federal law enforcement positions.
January 9, 2026 at 2:15 PM
I think it is probably a bad idea to put clearly unhinged, angry psychopaths in federal law enforcement positions.
The recent days have been horrific. We can't become numb to repeated instances of illegal and unconstitutional action by government agencies. It's even worse when public officials are blatantly lying in ways that contradict dozens of pieces of video evidence.
Sen. Lankford blatantly lies about what the video of Renee Good's killing shows: "A classic law enforcement moment -- they have to fire their weapon and then when you see her car crash, law enforcement is running to her to provide aid. They're never looking to be able to take a life of individuals."
January 9, 2026 at 9:40 PM
The recent days have been horrific. We can't become numb to repeated instances of illegal and unconstitutional action by government agencies. It's even worse when public officials are blatantly lying in ways that contradict dozens of pieces of video evidence.
Please welcome Google's Open Source efforts to Blue Sky at @opensource.google!
January 7, 2026 at 9:12 PM
Please welcome Google's Open Source efforts to Blue Sky at @opensource.google!
My first @waymo.bsky.social ride on the highway! Very smooth. Awesome work, Waymo team!
January 6, 2026 at 7:51 PM
My first @waymo.bsky.social ride on the highway! Very smooth. Awesome work, Waymo team!
In 2024, I was a co-author on "Shaping AI's Impact on Billions of Lives", covering areas we thought AI would have significant impact on the world.
A shortened version appears as the cover article in this month's CACM:
cacm.acm.org/research/sha...
arxiv.org/abs/2412.02730
See: shapingai.com
A shortened version appears as the cover article in this month's CACM:
cacm.acm.org/research/sha...
arxiv.org/abs/2412.02730
See: shapingai.com
January 6, 2026 at 4:04 PM
In 2024, I was a co-author on "Shaping AI's Impact on Billions of Lives", covering areas we thought AI would have significant impact on the world.
A shortened version appears as the cover article in this month's CACM:
cacm.acm.org/research/sha...
arxiv.org/abs/2412.02730
See: shapingai.com
A shortened version appears as the cover article in this month's CACM:
cacm.acm.org/research/sha...
arxiv.org/abs/2412.02730
See: shapingai.com
Reposted by Jeff Dean
It’s genuinely wild that the United States spent decades building an elaborate rules-based international order which de facto cemented its permanent status as the dominant global hegemon, sustained by ideology rather than might, and now is just blowing it all up for literally no reason
January 6, 2026 at 12:35 AM
It’s genuinely wild that the United States spent decades building an elaborate rules-based international order which de facto cemented its permanent status as the dominant global hegemon, sustained by ideology rather than might, and now is just blowing it all up for literally no reason
My colleague Sanjay Ghemawat & I have done a fair bit of performance tuning of various pieces of code. We wrote an internal Performance Hints document ~2 years ago as a way of identifying some general principles & we've recently published a version of it externally.
Doc: abseil.io/fast/hints.h...
Doc: abseil.io/fast/hints.h...
December 19, 2025 at 10:25 PM
My colleague Sanjay Ghemawat & I have done a fair bit of performance tuning of various pieces of code. We wrote an internal Performance Hints document ~2 years ago as a way of identifying some general principles & we've recently published a version of it externally.
Doc: abseil.io/fast/hints.h...
Doc: abseil.io/fast/hints.h...
We’ve pushed out the Pareto frontier of efficiency vs. intelligence again.
With Gemini 3 Flash ⚡️, we are seeing reasoning capabilities previously reserved for our largest models. This opens up entirely new categories of near real-time applications that require complex thought.
More in thread ⬇️
With Gemini 3 Flash ⚡️, we are seeing reasoning capabilities previously reserved for our largest models. This opens up entirely new categories of near real-time applications that require complex thought.
More in thread ⬇️
December 17, 2025 at 5:38 PM
We’ve pushed out the Pareto frontier of efficiency vs. intelligence again.
With Gemini 3 Flash ⚡️, we are seeing reasoning capabilities previously reserved for our largest models. This opens up entirely new categories of near real-time applications that require complex thought.
More in thread ⬇️
With Gemini 3 Flash ⚡️, we are seeing reasoning capabilities previously reserved for our largest models. This opens up entirely new categories of near real-time applications that require complex thought.
More in thread ⬇️
Reposted by Jeff Dean
The multimodal reasoning is very cool. Something I’ve been tracking with models for a while and Gemini 3 Pro was the first to produce a plausible response.
I’ve had a running test for multimodal models over the last ~year: extract the “Crss” values for each tick mark in this chart. GPT 5 makes up numbers, Claude 4.5 refuses to try, Qwen3 VL has a plausible guess. Gemini 3 pro pretty much nails it.
November 19, 2025 at 3:09 AM
The multimodal reasoning is very cool. Something I’ve been tracking with models for a while and Gemini 3 Pro was the first to produce a plausible response.
I’m really excited about our release of Gemini 3 today, the result of hard work by many, many people in the Gemini team and all across Google! 🎊
blog.google/products/gem...
Gemini 3 performs quite well on a wide range of benchmarks.
blog.google/products/gem...
Gemini 3 performs quite well on a wide range of benchmarks.
November 19, 2025 at 2:53 AM
I’m really excited about our release of Gemini 3 today, the result of hard work by many, many people in the Gemini team and all across Google! 🎊
blog.google/products/gem...
Gemini 3 performs quite well on a wide range of benchmarks.
blog.google/products/gem...
Gemini 3 performs quite well on a wide range of benchmarks.
Reposted by Jeff Dean
Trump should release all of the Epstein files: every person and every document in the files.
November 15, 2025 at 12:18 AM
Trump should release all of the Epstein files: every person and every document in the files.
DataRater can continuously+adaptively learn which examples will improve an ML model the most during training.
Delighted to have worked on this with @luisazintgraf.bsky.social, @dancalian.bsky.social, @gregfar.bsky.social, Iurii Kemaev, et al. (see full list at the of Luisa's thread).
Delighted to have worked on this with @luisazintgraf.bsky.social, @dancalian.bsky.social, @gregfar.bsky.social, Iurii Kemaev, et al. (see full list at the of Luisa's thread).
Excited to share our new paper, "DataRater: Meta-Learned Dataset Curation"!
We explore a fundamental question: How can we *automatically* learn which data is most valuable for training foundation models?
Paper: arxiv.org/pdf/2505.17895 to appear at @neuripsconf.bsky.social
Thread 👇
We explore a fundamental question: How can we *automatically* learn which data is most valuable for training foundation models?
Paper: arxiv.org/pdf/2505.17895 to appear at @neuripsconf.bsky.social
Thread 👇
November 6, 2025 at 3:43 PM
DataRater can continuously+adaptively learn which examples will improve an ML model the most during training.
Delighted to have worked on this with @luisazintgraf.bsky.social, @dancalian.bsky.social, @gregfar.bsky.social, Iurii Kemaev, et al. (see full list at the of Luisa's thread).
Delighted to have worked on this with @luisazintgraf.bsky.social, @dancalian.bsky.social, @gregfar.bsky.social, Iurii Kemaev, et al. (see full list at the of Luisa's thread).
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/...
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
August 29, 2025 at 1:14 AM
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/...
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/...
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...
Try it out at gemini.google.com
Blog: blog.google/products/gem...
August 27, 2025 at 1:10 AM
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...
Try it out at gemini.google.com
Blog: blog.google/products/gem...
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...
cloud.google.com/blog/product...
August 21, 2025 at 1:39 PM
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...
cloud.google.com/blog/product...
Reposted by Jeff Dean
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
That’s going to take more investment from the City, State, & County. Great research from @urbaninstitute.bsky.social & @yonahfreemark.com
July 8, 2025 at 3:10 AM
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
That’s going to take more investment from the City, State, & County. Great research from @urbaninstitute.bsky.social & @yonahfreemark.com
Reposted by Jeff Dean
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 ).
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
June 30, 2025 at 1:30 PM
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 ).
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 ).
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! 🎉
June 28, 2025 at 5:33 AM
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! 🎉
Reposted by Jeff Dean
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
June 27, 2025 at 4:50 AM
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
Reposted by Jeff Dean
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
June 13, 2025 at 3:26 PM
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
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)
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)
June 10, 2025 at 3:35 PM
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)
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)
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...
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
May 6, 2025 at 3:08 PM
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...
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...
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/carl/papers/...
www.demarcken.org
April 23, 2025 at 9:51 AM
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/carl/papers/...