🔥 Hot Repo: 810× Faster — YC CEO's Exact Claude Setup

Garry Tan, Y Combinator's President & CEO, credits a 23-skill Claude Code toolkit for shipping 600,000 lines of production code in 60 days part-time — 810× his 2013 logical-code-per-day pace. The MIT-licensed repo hit 78K stars and released a PDF-generation skill this morning.

By OMC Editorial on 2026-04-20

Garry Tan, President and CEO of Y Combinator, has open-sourced the exact Claude Code workflow behind what he claims is an 810× increase in logical code output versus his 2013 pace. The repo — garrytan/gstackhttps://github.com/garrytan/gstack — has accumulated 78,000 GitHub stars since launching on March 11, 2026, and shipped a new /make-pdf skill this morning in version 1.4.0.0. The number Tan measures productivity in logical code change, not raw line counts, to control for AI inflation. By that method, his 2026 run rate is 11,417 logical lines per day versus 14 in 2013 — an 810× increase. Year-to-date through April 18, 2026 already exceeds 240× his entire 2013 output. Over the past 60 days: three production services, 40+ shipped features, approximately 600,000 lines of production code 35% are tests, produced part-time while running Y Combinator full-time. The full methodology and a reproduction script are published at docs/ONTHELOCCONTROVERSY.mdhttps://github.com/garrytan/gstack/blob/main/docs/ONTHELOCCONTROVERSY.md. What gstack is Twenty-three slash-command skills organized around a sprint workflow: think → plan → build → review → test → ship → reflect. Each skill maps to a named specialist role that Claude Code adopts: | Skill | Role | |---|---| | /office-hours | YC office hours — six forcing questions before any code is written | | /plan-ceo-review | Product scope review with four modes expand, trim, hold, reduce | | /plan-eng-review | Architecture lock-in with data-flow diagrams and failure modes | | /review | Staff engineer code review; auto-fixes obvious issues, flags completeness gaps | | /qa | QA lead with a real Playwright browser; generates regression tests per bug | | /cso | OWASP Top 10 + STRIDE audit with a confidence gate and false-positive exclusion list | | /ship | Sync main, run tests, open PR; bootstraps a test framework if none exists | | /codex | Cross-model second opinion from OpenAI Codex CLI | Each skill is plain Markdown. Installatio