After 13 years away from coding, Tan used Claude Code to rebuild Posthaven in about five days for roughly $200, compared with a year and a half and a team of six the first time. He then adapted the work into Gary's List, a publishing platform that researches topics using web sources, social posts, and retrieval tools.
Tokenmaxxing: How Top Builders Use AI To Do The Work Of 400 Engineers
Speaker
Garry Tan, CEO of Y Combinator, joins the hosts of The Light Cone to explain how he uses AI agents to build software and research projects.
Tan argues that paying for more model calls can make research more complete. For Gary's List, he says roughly $5 to $10 in model calls can support work that would take a person much longer, and the system compares many sources before drafting. He applies the same approach to coding when extra model effort improves the result.
Tan collected prompts he kept reusing and shaped them into G Stack skills for planning, design, engineering review, and testing. He says asking an agent to map data flows and user journeys before coding helped it handle complex work more completely. He also uses browser based QA and brings in Codex to review plans or code for bugs.
Tan says people need to provide the goals, context, and product judgment, while agents handle work the person would rather not do. His approach puts flexible instructions in Markdown skills and deterministic actions in code, with 80 to 90 percent test coverage as a practical target. He describes OpenClaw as powerful but fragile enough that users should know how to troubleshoot it.
Tan predicts personal AI will become broadly available and frames the key question as whether people control their tools and prompts. He and the host compare token spending to paying for a useful startup advantage, arguing builders should spend more when the work creates real value. Tan says directing many agents helped him produce about 400 times as much code as when he last coded, while emphasizing that he directed the work rather than writing it himself.
Takeaways
- Use agents to gather and compare many sources when completeness matters.
- Turn repeated instructions into reusable skills, and include diagrams before complex implementation.
- Keep humans responsible for goals, user needs, and product judgment.
- Test agent built features with integration checks and hands on browser QA.
- Spend more on tokens when the added work creates meaningful value.
Mentioned in this talk
Search inside this talk
What was claimed 18
- built
“I've been building mine in the open.”
13:28inEvery company should have a BrainYouTube Verified5 sources· Talk, Web· archived
- role atGarry Tan is runs Y Combinator full-time at
Y Combinator
“I'm Garry, president and CEO of Y Combinator.”
0:09inHow to Make Claude Code Your AI Engineering TeamYouTube Verified7 sources· Talk
- built
“I built GStack to encode this three weeks ago”
0:50inHow to Make Claude Code Your AI Engineering TeamYouTube Verified2 sources· Talk
- metricGarry Tan: About 400 times the amount of work he was doing before returning to coding
“I'm doing about 400 times the amount of work”
YouTube Unverified1 source· Talk
- usesGarry Tan uses
Claude Code
“powered up Claude Code and started to get back to coding”
YouTube Unverified1 source· Talk
- built
“I ended up building Posterous, my first YC startup, in 2008.”
YouTube Unverified1 source· Talk
- featureGarry's List: Full RAG and agentic retrieval, including recursive crawling and deep research
“it has full RAG and agentic retrieval”
YouTube Unverified1 source· Talk
- metricGarry Tan: About five days and $200 to rebuild Posterous
“this time, it took about $200 ... and probably five days”
YouTube Unverified1 source· Talk
- builtGarry Tan built Garry's List
“In January of this year, I ended up writing it a third time.”
YouTube Unverified1 source· Talk
- built
“I actually built it again as Posthaven”
YouTube Unverified1 source· Talk
- acquiredabout $20 million
“Twitter bought it for about $20 million.”
YouTube Unverified1 source· Talk
- integrates with
“It works with any harness, but it loves OpenClaw”
13:28inEvery company should have a BrainYouTube Verified2 sources· Talk
- usesruns multiple coding sessions in parallel
“This is how I use Conductor.”
YouTube Verified2 sources· Talk
- metricGarry Tan: 13 pull requests in 48 hours
“I dropped 13 PRs in the last 48 hours.”
YouTube Unverified1 source· Talk
- usesGarry Tan uses
Playwright
“wrap Microsoft’s Playwright”
YouTube Unverified1 source· Talk
- uses
“runs Codex in a command-line prompt”
YouTube Unverified1 source· Talk
- metricBrowse: 70 commands
“a long-lived HTTP daemon with 70 commands as a CLI”
YouTube Unverified1 source· Talk
- uses
“QA is just Browse”
YouTube Unverified1 source· Talk







