Agent Friendly Code

Which public repos are easiest for GPT-5 Codex to work in?

Repos from GitHub, GitLab, and Bitbucket, ranked by their GPT-5 Codex score rather than the average across every agent. gitlab-org/cli leads with 97.7.

The methodology lists the weight GPT-5 Codex gives each check and the documentation it comes from.

GPT-5 Codex — Reads AGENTS.md before doing any work per OpenAI's Codex docs. Hierarchical (per-directory) AGENTS.md and AGENTS.override.md are first-class.
Leaderboard — page 11 of 12 for GPT-5 Codex
RankRepoStarsScoreExternal link
321apache/dorisGitHub16.1k ★
58.1
open
322laravel/laravelGitHub85.1k ★
58.0
open
323apache/arrowGitHub17.2k ★
58.0
open
324google/guavaGitHub51.9k ★
57.9
open
325netty/nettyGitHub35.1k ★
57.9
open
326numpy/numpyGitHub33.1k ★
57.5
open
327flutter/samplesGitHub19.3k ★
57.5
open
328rrousselGit/riverpodGitHub7.4k ★
57.5
open
329fdroid/fdroidclientGitLab2.7k ★
56.9
open
330expressjs/expressGitHub69.6k ★
56.3
open
331phpstan/phpstanGitHub14.1k ★
56.1
open
332rayon-rs/rayonGitHub13.4k ★
56.0
open
333seanmonstar/reqwestGitHub11.9k ★
56.0
open
334Significant-Gravitas/AutoGPTGitHub187.5k ★
55.5
open
335flutter/flutterGitHub180k ★
55.5
open
336kicad/code/kicadGitLab1.1k ★
55.5
open
337anthropics/claude-codeGitHub150.4k ★
55.3
open
338spring-projects/spring-bootGitHub81.6k ★
55.2
open
339openssl/opensslGitHub30.9k ★
54.7
open
340gnachman/iterm2GitLab1.5k ★
54.5
open
341firecrawl/firecrawlGitHub190.9k ★
54.1
open
342jekyll/jekyllGitHub51.7k ★
53.2
open
343sgl-project/sglangGitHub37k ★
53.2
open
344erlang/otpGitHub12.4k ★
52.7
open
345openai/openai-cookbookGitHub76.6k ★
52.1
open
346redis/redisGitHub76.8k ★
51.9
open
347cloudflare/aiGitHub1.2k ★
51.7
open
348serde-rs/serdeGitHub10.9k ★
50.7
open
349postgres/postgresGitHub22.4k ★
50.0
open
350getlago/lagoGitHub10.7k ★
50.0
open
351swiftlang/swiftGitHub70.5k ★
49.3
open
352dotnet/mauiGitHub23.3k ★
49.3
open

Tracking 371 repos · last updated