Principal ML Researcher at @Brave, ex @TEFResearch, @imperialcollege, @qmul. Views my own.
London, UK
Joined April 2011
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Kleomenis Katevas retweeted
The charity ride takes place this Sunday!
Thank you to everyone who has donated so far and helped us crush our goal. 🫶
In September, some of Brave's UK team will participate in the 55-mile London to Brighton Cycle Ride in support of Great Ormond Street Hospital Children's Charity!
We're proud to ride for a great cause and hope you'll consider donating.
Learn more here: justgiving.com/page/brave
Kleomenis Katevas retweeted
@Brave's research and security folks in our London office built a power lab, BLaDE, with a high-sensitivity digital power meter / supply wired up to test phones in place of pulled batteries.
Excellent work, chaps!
Here's a pic, with labels.
"...only ever gonna be one Blade!"
If you care about performance, Brave should be your browser.
We tested Brave for desktop against Chrome, Edge and Firefox and found that Brave is faster, uses less energy, consumes less CPU and memory, and transfers less data.
ALT Bar chart measuring the request size (MB) per page load across the four tested desktop browsers. Lower scores are better. Reducing the amount of data transmitted by the browser is not only meaningful for privacy but also reduces upload bandwidth consumption and the CPU overhead.
Really proud to share our latest performance evaluation, showing that @brave Desktop outperforms our competitors across key performance metrics.
Read more in our latest blog post.
If you care about performance, Brave should be your browser.
We tested Brave for desktop against Chrome, Edge and Firefox and found that Brave is faster, uses less energy, consumes less CPU and memory, and transfers less data.
ALT Bar chart measuring the request size (MB) per page load across the four tested desktop browsers. Lower scores are better. Reducing the amount of data transmitted by the browser is not only meaningful for privacy but also reduces upload bandwidth consumption and the CPU overhead.
Kleomenis Katevas retweeted
The CEO of Brave, @BrendanEich, has called on Apple and Mozilla to add Brave Search as a default option among the list that's in the search engine picker.
Google has already done this on Chrome.
While you can still add a custom search engine on Firefox, Safari offers no such choice.
The CEO emphasizes how it's not very user-friendly to restrict options like this, since it promotes a duopoly.
More:
piunikaweb.com/2026/08/05/br…
Kleomenis Katevas retweeted
Good on Google adding Brave Search to Chrome's global default search engines list so Chrome users can switch to Brave Search in settings.
Safari should do the same. Listing only Google, Bing, three Bing-skins does not support user choice vs. duopoly.
Firefox should do this too.
@Brave grew to over 122M Monthly Active Users and 51M DAU in July 2026.
Brave Search joined Chrome's global default search engine list.
All browsers see a "summer slump," but our growth was stronger than past years, in part thanks to the World Cup driving new user growth.
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Kleomenis Katevas retweeted
In September, some of Brave's UK team will participate in the 55-mile London to Brighton Cycle Ride in support of Great Ormond Street Hospital Children's Charity!
We're proud to ride for a great cause and hope you'll consider donating.
Learn more here: justgiving.com/page/brave
Kleomenis Katevas retweeted
Agents are getting supervisors for safety, security, and privacy. We introduced a novel one for efficiency, because wasted battery isn't just wasteful — it creates real frustration and anxiety for users, especially on mobile devices where battery anxiety is already a real concern
Our latest work, @brave's AgentStop, will be presented today by Dzung Pham at the new @CAISconf in San Jose, California!
If you're attending, stop by and chat with Dzung to learn more. Joint work with Dzung Pham, @AliShahinShams1 and Hamed Haddadi
Kleomenis Katevas retweeted
Excited to share that AgentStop (an open-source efficiency supervisor for agents), joint @brave work with Dzung, @minoskt , and Hamed, has been accepted at ACM Conference on AI and Agentic Systems (@CAISconf 2026)!
Kleomenis Katevas retweeted
When Zero-Knowledge Proofs Are Not Enough: Lessons from a Real-World Zero-Knowledge Authorization System, a.k.a Analysis and Vulnerabilities in zkLogin (eprint.iacr.org/2026/227) (1/n)
Kleomenis Katevas retweeted
This was a lot of work across security, privacy, bizdev and Search teams, so big kudos to all. Check out our snazzy Trust Center trust.brave.app 🤩
The Brave Search API has earned our first SOC 2 Type II attestation following a thorough external audit!
SOC 2 provides independent verification to Search API customers that our internal security practices meet industry standards.
More details here: brave.com/blog/soc2/
Kleomenis Katevas retweeted
From @AliShahinShams1 on Brave Research team, a DePIN for AI issue:
"One can reconstruct (system) prompt based on intermediate embeddings when the LLM inference is distributed among nodes."
Paper: arxiv.org/pdf/2503.09291
@NEARProtocol's DCML avoids via encryption into TEEs.
Kleomenis Katevas retweeted
Excited to share that my internship project has been accepted at EMNLP! Grateful for the amazing experience working with @AliShahinShams1 and @minoskt in @Brave.
LLMs are everywhere, but can they pose privacy risks?
We introduce a Context-Aware Membership Inference Attack, assessing such privacy risks.
Paper: arxiv.org/pdf/2409.13745
@brave blog: brave.com/blog/privacy-in-ll…
Authors: @Hongyan_Chang @AliShahinShams1 @minoskt Hamed @rzshokri
Kleomenis Katevas retweeted
LLMs are everywhere, but can they pose privacy risks?
We introduce a Context-Aware Membership Inference Attack, assessing such privacy risks.
Paper: arxiv.org/pdf/2409.13745
@brave blog: brave.com/blog/privacy-in-ll…
Authors: @Hongyan_Chang @AliShahinShams1 @minoskt Hamed @rzshokri
Kleomenis Katevas retweeted
@Brave passed 100M Monthly Active Users (MAU) in September 2025. DAU grew faster, past 42M.
Blog post at brave.com/blog/100m-mau/.
Brave Search at 1.66B Queries Per Month (QPM) annualizes to 19.49B QPY.
Non-Brave-browser search users grew 10% in September (7.60% → 8.36%).
1/4
@Brave hit 97.8M Monthly Active Users (MAU) in August 2025.
Brave Search at 1.56B Queries Per Month (QPM) annualizes to 18.36B QPY.
All-browsers summer slump is over. On to 100M MAU!
Of particular note: from June to August 2025, we have seen a 26.4% increase in Linux MAU.
1/4
Kleomenis Katevas retweeted
Excited to have our official Brave Search MCP Server made available on @SmitheryDotAI. Huge thanks to @arjunkmrm and team for their assistance, and for building such an impressive platform and service.
Head over to smithery.ai/server/@brave/mc… and check out the hosted MCP server. You'll need a Brave Search API key, which you can get for free (2K queries per month) at brave.com/search/api/.
🚀 Check out the latest benchmarks showing Brave for Android outperforming the competition.
If systems performance is your thing, we’re hiring! Join us as a Systems and Performance Researcher/Engineer (UK, preferably London-based) — more info here: job-boards.greenhouse.io/bra…