Eugene Yan
Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.
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Where they publish
eugeneyan.comSite His writing on LLMs, recommender systems, evaluation and engineering practice.
Recent
- Patterns for Building Cybersecurity Evals 21 Jun 2026
- Using LLMs to Secure Source Code 27 May 2026
- How to Work and Compound with AI 3 May 2026
Show 17 more
- 2025 Year in Review 14 Dec 2025
- Product Evals in Three Simple Steps 23 Nov 2025
- Advice for New Principal Tech ICs (i.e., Notes to Myself) 19 Oct 2025
- Training an LLM-RecSys Hybrid for Steerable Recs with Semantic IDs 14 Sept 2025
- Evaluating Long-Context Question & Answer Systems 22 Jun 2025
- AI Engineer 2025 - Improving RecSys & Search with LLM techniques 4 Jun 2025
- Exceptional Leadership: Some Qualities, Behaviors, and Styles 18 May 2025
- Building News Agents for Daily News Recaps with MCP, Q, and tmux 4 May 2025
- An LLM-as-Judge Won't Save The Product—Fixing Your Process Will 20 Apr 2025
- Frequently Asked Questions about My Writing Process 30 Mar 2025
- NVIDIA GTC 2025 - Building LLM-Powered Applications 18 Mar 2025
- Improving Recommendation Systems & Search in the Age of LLMs 16 Mar 2025
- Building AI Reading Club: Features & Behind the Scenes 12 Jan 2025
- 2024 Year in Review 22 Dec 2024
- Seemingly Paradoxical Rules of Writing 1 Dec 2024
- How to Run a Weekly Paper Club (and Build a Learning Community) 24 Nov 2024
- My Minimal MacBook Pro Setup Guide 17 Nov 2024
Link verified 4 Sept 2026. Recent items update automatically from the channel.
@eugeneyanx.com Posts about his writing, ML systems and evals.
Recent
- Fable 5.1 is a thoughtful collaborator, thinking hard about my requests, proactively patching my blindspots, and verifying the work's correct without being ask… 1 Sept 2026
- When evaling models, we anchor on the median task. But this is like how devs estimate the median task accurately but underestimate the mean which tends to be ~… 22 Jul 2026
- I’m at @aiDotEngineer and hanging out around the music corner on the 2nd floor from 1415 - 1515! Come by to chat about https://t.co/pdd8bk66Jz, https://t.co/eJ… 1 Jul 2026
Show 14 more
- How do we eval if a model can find and exploit vulnerabilities? We discuss some benchmarks and the common pattern: • A sandboxed target within Docker container… 25 Jun 2026
- I've been loving the multiplayer form factor of Claude Tag. Now others can reply on the thread to provide context and direction to Claude! 23 Jun 2026
- Stronger models have made finding vulnerabilities easier, and the bottleneck has shifted to verification, triage, patching. Here are some lessons from working… 3 Jun 2026
- Cloudflare on their vulnerabilty discovery harness • Recon: Read the codebase, return an architecture doc • Hunt: ~50 agents look for bugs concurrently • Valid… 18 May 2026
- Claude Mythos Preview case studies (also, read your transcripts!) https://t.co/drNlAH5mLE > "Mythos demonstrates its bug reproduction and exploitation capabili… 15 May 2026
- Mythos evals from XBOW and UK AISI: • UK AISI: Mythos completed a 32-step network attack (est. at ~20 hrs for experts) in 6/10 tries. First model to solve thei… 13 May 2026
- Mozilla fixing more bugs in April that the past 15 months is what riding the exponential looks like 🎢 8 May 2026
- you get more compute. you get more compute. you get more compute! Anthropic 🤝 SpaceX 6 May 2026
- some thoughts on working with ai models • context as infra • taste as config • verification for autonomy • scaling via delegation • closing the loop 6 May 2026
- excited to share this and help everyone be more cyber secure 30 Apr 2026
- Great writeup by @mozilla: Mythos found 271 vulns (fixed in Firefox 150); Opus 4.6 found 22 (fixed in Firefox 148) https://t.co/wzTCxmTKbe > "So far we’ve foun… 21 Apr 2026
- Cheng’s experiment is cool! Especially this: “instead of starting with easy sudoku puzzles data and gradually ramping up toward harder ones, the training runs… 14 Mar 2026
- yay for automatic prefix caching! just set a single cache control field at the top level of your request body. note that you do still need to structure your pr… 20 Feb 2026
- Sonnet 4.6 is a big upgrade over 4.5. And it has 1M context! It's also versatile across classification, coding, computer use, autonomous agents by adjusting ef… 18 Feb 2026
Link verified 4 Sept 2026. Recent items update automatically from the channel.
github.com/eugeneyanGitHub His open-source repos, including applied-ml.
Recent
- eugeneyan 22 Jun 2026
- semantic-ids-llm — Semantic IDs: How to train an LLM-Recommender Hybrid with steerability and reasoning on recommendations. 15 Sept 2025
- news-agents — 📰 Building News Agents to Summarize News with MCP, Q, and tmux 19 Jul 2025
Show 15 more
- open-llms — 📋 A list of open LLMs available for commercial use. 13 Feb 2025
- align-app 9 Nov 2024
- framework-comparison 9 Sept 2024
- llm-paper-notes — Notes from the Latent Space paper club. Follow along or start your own! 31 Jul 2024
- applied-ml — 📚 Papers & tech blogs by companies sharing their work on data science & machine learning in production. 18 Jul 2024
- papermill-mlflow — 🧪 Simple data science experimentation & tracking with jupyter, papermill, and mlflow. 9 Jul 2024
- recsys-nlp-graph — 🛒 Simple recommender with matrix factorization, graph, and NLP. Beating the regular collaborative filtering baseline. 7 Jul 2024
- discord-llm — Experimenting with LLMs to Research, Reflect, and Plan (LLM assistants, retrieval, and Discord integration) 7 Jul 2024
- obsidian-copilot — 🤖 A prototype assistant for writing and thinking 30 Jun 2024
- workspace-testing 24 Jun 2024
- poc-docker-template — Simple template showing how to set up docker for reproducible data science with Jupyter notebooks. 17 Jun 2024
- applyingml — 📌 Papers, guides, and mentor interviews on applying machine learning for ApplyingML.com—the ghost knowledge of machine learning. 5 Jun 2024
- visualizing-finetunes 27 May 2024
- 1-on-1s — 🌱 1-on-1 questions and resources from my time as a manager. 11 May 2024
- python-collab-template — 🛠 Python project template with unit tests, code coverage, linting, type checking, Makefile wrapper, and GitHub Actions. 14 Apr 2024
Link verified 4 Sept 2026. Recent items update automatically from the channel.
Recommends rcmnd
What they recommendrcmnd 11 things — each backed by an exact quote.
Compiled by rcmnd.app, not by them: the quotes are theirs, and each links to the post it was copied from.
Recent
MX Ergo Uses
sign in to load saved settings for my MX Ergo
eugeneyan.com 2024-11-17
Raycast Uses
I've since moved to Raycast window management.
eugeneyan.com 2024-11-17
Rectangle Mixed on
While Raycast already has window management, Rectangle lets you hit the hotkey again
eugeneyan.com 2024-11-17
Show 8 more
Fish Uses
Warp Uses
Instapaper Uses
To read papers, I use Adobe Acrobat Reader and sync them in the cloud. This lets me read, highlight, and sync my papers across devices (work laptop, personal laptop, iPad). Instapaper does the same for online articles.
eugeneyan.com 2020-09-13
Adobe Acrobat Reader Uses
To read papers, I use Adobe Acrobat Reader and sync them in the cloud. This lets me read, highlight, and sync my papers across devices (work laptop, personal laptop, iPad). Instapaper does the same for online articles.
eugeneyan.com 2020-09-13
Kindle Uses
MacDown Recommends
For a free Markdown editor (on Mac), I can't recommend MacDown highly enough. It has a simple interface with an editor and preview pane and it just works.
eugeneyan.com 2020-09-13
Bear Uses
Roam Uses
I use Roam as my main note-taking app. While I only use very basic features such as bidirectional links and reference blocks, it works well enough for me.
eugeneyan.com 2020-09-13
Latest
Full feed →Everything, newest firstFeed Posts, repos and recommendations from the cards above, in one stream.
Filter & sortAll sources · condensed
- Fable 5.1 is a thoughtful collaborator, thinking hard about my requests, proactively patching my blindspots, and verifying the work's correct without being ask… 1 Sept Quoting@claudeaiWe’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world’s most advanced models for coding and knowledge work.
- When evaling models, we anchor on the median task. But this is like how devs estimate the median task accurately but underestimate the mean which tends to be ~… 22 Jul Quoting@Steve_YeggeFable is careful. None of the other models are careful. GPT-5.6 Sol, Opus, Kimi, Grok. You can compare them all day long on capabilities, a…
- I’m at @aiDotEngineer and hanging out around the music corner on the 2nd floor from 1415 - 1515! Come by to chat about https://t.co/pdd8bk66Jz, https://t.co/eJ… 1 Jul
- How do we eval if a model can find and exploit vulnerabilities? We discuss some benchmarks and the common pattern: • A sandboxed target within Docker container… 25 Jun
- I've been loving the multiplayer form factor of Claude Tag. Now others can reply on the thread to provide context and direction to Claude! 23 Jun Quoting@claudeaiIntroducing Claude Tag, a new way for teams to work with Claude. In Slack, Claude joins as a team member with access to the channels and to…
- eugeneyan 22 Jun
Show 50 more
- Patterns for Building Cybersecurity Evals 21 Jun
- Stronger models have made finding vulnerabilities easier, and the bottleneck has shifted to verification, triage, patching. Here are some lessons from working… 3 Jun
- Using LLMs to Secure Source Code 27 May
- Cloudflare on their vulnerabilty discovery harness • Recon: Read the codebase, return an architecture doc • Hunt: ~50 agents look for bugs concurrently • Valid… 18 May
- Claude Mythos Preview case studies (also, read your transcripts!) https://t.co/drNlAH5mLE > "Mythos demonstrates its bug reproduction and exploitation capabili… 15 May
- Mythos evals from XBOW and UK AISI: • UK AISI: Mythos completed a 32-step network attack (est. at ~20 hrs for experts) in 6/10 tries. First model to solve thei… 13 May
- Mozilla fixing more bugs in April that the past 15 months is what riding the exponential looks like 🎢 8 May
- you get more compute. you get more compute. you get more compute! Anthropic 🤝 SpaceX 6 May Quoting@claudeaiEffective today, we are: 1) Doubling Claude Code’s 5-hour rate limits for Pro, Max, and Team plans; 2) Removing the peak hours limit reduct…
- some thoughts on working with ai models • context as infra • taste as config • verification for autonomy • scaling via delegation • closing the loop 6 May
- How to Work and Compound with AI 3 May
- excited to share this and help everyone be more cyber secure 30 Apr Quoting@claudeaiClaude Security is now in public beta for Claude Enterprise customers. Claude scans your codebase for vulnerabilities, validates each findi…
- Great writeup by @mozilla: Mythos found 271 vulns (fixed in Firefox 150); Opus 4.6 found 22 (fixed in Firefox 148) https://t.co/wzTCxmTKbe > "So far we’ve foun… 21 Apr
- Cheng’s experiment is cool! Especially this: “instead of starting with easy sudoku puzzles data and gradually ramping up toward harder ones, the training runs… 14 Mar Quoting@_chenglouI’m very happy to present my toy research project: Sotaku! It's a neural net that automatically discovered the rules of sudoku and learned…
- 2025 Year in Review 14 Dec 2025
- Product Evals in Three Simple Steps 23 Nov 2025
- Advice for New Principal Tech ICs (i.e., Notes to Myself) 19 Oct 2025
- semantic-ids-llm — Semantic IDs: How to train an LLM-Recommender Hybrid with steerability and reasoning on recommendations. 15 Sept 2025
- Training an LLM-RecSys Hybrid for Steerable Recs with Semantic IDs 14 Sept 2025
- news-agents — 📰 Building News Agents to Summarize News with MCP, Q, and tmux 19 Jul 2025
- Evaluating Long-Context Question & Answer Systems 22 Jun 2025
- AI Engineer 2025 - Improving RecSys & Search with LLM techniques 4 Jun 2025
- Exceptional Leadership: Some Qualities, Behaviors, and Styles 18 May 2025
- Building News Agents for Daily News Recaps with MCP, Q, and tmux 4 May 2025
- An LLM-as-Judge Won't Save The Product—Fixing Your Process Will 20 Apr 2025
- Frequently Asked Questions about My Writing Process 30 Mar 2025
- NVIDIA GTC 2025 - Building LLM-Powered Applications 18 Mar 2025
- Improving Recommendation Systems & Search in the Age of LLMs 16 Mar 2025
- open-llms — 📋 A list of open LLMs available for commercial use. 13 Feb 2025
- Warp 17 Nov 2024 Usesaffiliate link
- Fish 17 Nov 2024 Uses
- Rectangle 17 Nov 2024 Mixed on
- Raycast 17 Nov 2024 Uses
- MX Ergo 17 Nov 2024 Uses
- align-app 9 Nov 2024
- framework-comparison 9 Sept 2024
- llm-paper-notes — Notes from the Latent Space paper club. Follow along or start your own! 31 Jul 2024
- applied-ml — 📚 Papers & tech blogs by companies sharing their work on data science & machine learning in production. 18 Jul 2024
- papermill-mlflow — 🧪 Simple data science experimentation & tracking with jupyter, papermill, and mlflow. 9 Jul 2024
- recsys-nlp-graph — 🛒 Simple recommender with matrix factorization, graph, and NLP. Beating the regular collaborative filtering baseline. 7 Jul 2024
- discord-llm — Experimenting with LLMs to Research, Reflect, and Plan (LLM assistants, retrieval, and Discord integration) 7 Jul 2024
- obsidian-copilot — 🤖 A prototype assistant for writing and thinking 30 Jun 2024
- workspace-testing 24 Jun 2024
- poc-docker-template — Simple template showing how to set up docker for reproducible data science with Jupyter notebooks. 17 Jun 2024
- applyingml — 📌 Papers, guides, and mentor interviews on applying machine learning for ApplyingML.com—the ghost knowledge of machine learning. 5 Jun 2024
- Roam 13 Sept 2020 Uses
- Bear 13 Sept 2020 Uses
- MacDown 13 Sept 2020 Recommends
- Kindle 13 Sept 2020 Uses
- Adobe Acrobat Reader 13 Sept 2020 Uses
- Instapaper 13 Sept 2020 Uses