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Repo of the Month Jun 2025 · +10%

👩‍💻Codex

ACTIVE BREAKOUT

openai/codex

Lightweight coding agent that runs in your terminal

⭐ Hugely popular: 106k stars, gaining about 2k a week

View on GitHub ↗

repo profile

vintage 2025 1 year old
delivery product
language Rust
license Apache-2.0

momentum

total stars 106k
stars added last week +2k
HN peak 516 pts 1y 4mo ago
binary downloads 167k total · GitHub releases
commits / week 238 accelerating · +41% vs prior mo
issues closed 53% closed same-day, median
contributors 558 (+26 in 15d)
release cadence weekly
last activity today

durability

backing company-owned OpenAI
openness permissive
security score 5.9/10 OpenSSF Scorecard · 2026-08-10
bus factor 7 distributed
top-author share 17% 6 mo

bus factor = how many people it takes to cover more than half the commits (6 months). 1 is a solo project; higher means the work is spread across a team. top-author share is the single busiest author's slice of those commits.

since we covered it

monthly average + 7k/mo (+26504%/mo) · + 106k total since PR#9

why it's a big deal

  • Local Execution: Runs entirely in your terminal, keeping your codebase secure and private.
  • Multimodal Inputs: Accepts text, screenshots, or diagrams to generate or edit code accordingly.
  • Flexible Approval Modes: Offers distinct modes to control the level of automation in code generation.

under the hood

  • Powered by Codex-1: Utilizes a version of OpenAI’s o3 model optimized for software engineering tasks.
  • Sandboxed Environments: Each task runs in an isolated environment preloaded with your repository.
  • Extensible Architecture: Designed for integration and customization to fit various development workflows.

our take from PR#9, 2025-05-28

star history

PR#9 · 27106k now Apr 2025Aug 2026
  1. PR#9 27 2025-05-28
  2. now 106k + 106k since first covered

curve is sampled from GitHub's star history, plus our own daily readings since we covered it; the dashed stretch is before we first covered it, the solid line since. figures at coverage are the numbers we printed then (approx.), current count is live.

understory

Quietly building: more output than attention, for now.

+11 understory score output 100 · clout 89
Aug 2025 Jul 2026
  • output, commits & releases
  • clout, star velocity

output = commits & releases; clout = star velocity, both 0 to 100 monthly indices; the gap where output runs above clout is the understory. The understory →

covered in

  • PR#9 2025-05-28 on the radar

    Terminal-Based AI Coding Agent

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