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 9 of 12 for GPT-5 Codex
RankRepoStarsScoreExternal link
257different-ai/openworkGitHub24.1k ★
68.0
open
258elastic/elasticsearchGitHub78.2k ★
67.9
open
259spring-projects/spring-frameworkGitHub60.3k ★
67.9
open
260date-fns/date-fnsGitHub36.6k ★
67.9
open
261trinodb/trinoGitHub13.3k ★
67.9
open
262StarRocks/starrocksGitHub12.2k ★
67.9
open
263python/cpythonGitHub77.6k ★
67.6
open
264shadcn-ui/uiGitHub125.4k ★
67.2
open
265protocolbuffers/protobufGitHub72.1k ★
66.8
open
266haskell/cabalGitHub1.7k ★
66.5
open
267tailwindlabs/tailwindcssGitHub97.9k ★
66.4
open
268drizzle-team/drizzle-ormGitHub36k ★
66.4
open
269honojs/honoGitHub32.5k ★
66.4
open
270hashicorp/terraformGitHub49.9k ★
66.1
open
271bevyengine/bevyGitHub48.9k ★
66.0
open
272google-deepmind/mujocoGitHub15.6k ★
66.0
open
273rust-lang/cargoGitHub15.6k ★
66.0
open
274git/gitGitHub63.8k ★
65.9
open
275alacritty/alacrittyGitHub65.9k ★
65.2
open
276pointfreeco/swift-composable-architectureGitHub15k ★
65.2
open
277snakeyaml/snakeyamlBitbucket—
65.2
open
278openai/codexGitHub128.8k ★
64.8
open
279charmbracelet/bubbleteaGitHub45.4k ★
64.8
open
280llvm/llvm-projectGitHub41k ★
64.8
open
281dagger/daggerGitHub16.3k ★
64.8
open
282immich-app/immichGitHub116.1k ★
64.0
open
283fmtlib/fmtGitHub25.9k ★
64.0
open
284apache/rocketmqGitHub22.6k ★
64.0
open
285sidekiq/sidekiqGitHub13.6k ★
64.0
open
286livebook-dev/livebookGitHub5.9k ★
63.9
open
287veloren/velorenGitLab2.4k ★
63.9
open
288championswimmer/TwoFacGitHub130 ★
63.9
open

Tracking 371 repos · last updated