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 8 of 12 for GPT-5 Codex
RankRepoStarsScoreExternal link
225questdb/questdbGitHub17.4k ★
70.8
open
226react/reactGitHub250.9k ★
70.7
open
227ClickHouse/ClickHouseGitHub50.4k ★
70.7
open
228quarkusio/quarkusGitHub15.9k ★
70.7
open
229django/djangoGitHub91.4k ★
70.5
open
230pocketbase/pocketbaseGitHub61.4k ★
70.5
open
231oban-bg/obanGitHub4k ★
70.5
open
232storybookjs/storybookGitHub91.3k ★
70.4
open
233expo/expoGitHub52.7k ★
70.4
open
234vitest-dev/vitestGitHub17.2k ★
70.3
open
235rust-lang/rustlingsGitHub64.3k ★
70.1
open
236fastapi/fastapiGitHub103.1k ★
70.0
open
237debezium/debeziumGitHub13.2k ★
69.9
open
238apache/icebergGitHub9.3k ★
69.9
open
239nocodb/nocodbGitHub65.3k ★
69.7
open
240remix-run/react-routerGitHub56.6k ★
69.6
open
241fastify/fastifyGitHub37.3k ★
69.6
open
242symfony/aiGitHub1.2k ★
69.5
open
243kubernetes/kubernetesGitHub128.3k ★
69.2
open
244nikic/PHP-ParserGitHub17.5k ★
69.2
open
245ghostfolio/ghostfolioGitHub9.4k ★
69.2
open
246babashka/babashkaGitHub4.6k ★
69.2
open
247millionco/react-doctorGitHub15k ★
69.1
open
248cockroachdb/cockroachGitHub32.6k ★
68.8
open
249elixir-lang/elixirGitHub26.7k ★
68.7
open
250go-chi/chiGitHub23k ★
68.7
open
251apache/beamGitHub8.7k ★
68.7
open
252Anuken/MindustryGitHub29.3k ★
68.5
open
253libeigen/eigenGitLab1.2k ★
68.5
open
254phoenixframework/phoenixGitHub23.2k ★
68.3
open
255Aider-AI/aiderGitHub49.5k ★
68.0
open
256go-gorm/gormGitHub40k ★
68.0
open

Tracking 371 repos · last updated