OpenAI Codex

Slashy

“We chose Codex because it can work directly across a large, multi-repository codebase and carry implementation through testing and verification. It helps our small team move faster on real engineering work.”

Humalike

“Codex CLI is insane.”

MindPal

“Shoutout to Codex for being part of our engineering team.”

Replay

“Creating beautiful interfaces and long running coding sessions”

Vamah.ai

“One of the AI tools power our code base”

Notte

“Our agent uses it to build the automations”

TaskShell

“Making it possible to integrate MCPs seamlessly”

Almanac

“Codex gives Almanac the agentic reasoning to understand company knowledge and keep it useful.”

Edgee

“Our token compression technology has to be compatible and efficient with Codex, so we have to use it extensively to understand how we can optimize its context.”

HarnessRouter

“Codex is one of the three harnesses HarnessRouter routes to, and we use it in our own build loop. Its structured output made it one of the cleanest harnesses to normalize against.”

Velo

“Great for coding and building products like real quick.”

Chronock

“Codex works with me across the Chronock monorepo, from implementation and tests to refactoring and release work. Compared with editor-first tools such as Cursor or Windsurf, its agentic workflow is especially useful for completing repository-wide tasks and verifying them in the same environment. It accelerates AI-native development without replacing architecture, review, security, or product judgment; I remain responsible for the quality bar.”

Git Pitcher

“OpenAI helped shape the way I built Git Pitcher. I used AI reasoning and coding workflows to move faster from product idea to working implementation, especially while planning the repo analysis, artifact structure, and launch flow.”

Pushary

“Computer use helped me automate my testing lifecycle and act as an adversary”

Topview

“Thanks to Tibo for repeatedly refreshing our usage quota, allowing us to consistently use GPT-5.6 Ultra High for coding and development.”

Vokal

“A core local coding-agent workflow we designed Vokal around. Codex makes individual engineering work faster; Vokal helps teams coordinate that work.”

GetThis

“Helps us move faster from idea to implementation. Useful for prototyping, debugging, and shipping production-ready changes. A fast, reliable coding partner during development.”

OpenCode Superapp

“The best general purpose superapp”

“We built Deep Work Plan to be tool-agnostic, and Codex is a perfect example of why that matters: the plan is just files in the repo, so Codex reads it, runs the tasks, and passes the gates with zero changes. We lean on it for cloud, PR-first, parallel execution — hand it scoped tasks and let them run. It's proof that the methodology lives happily in any agent. One of the agents we use every day, each excellent in its own lane.”

“I chose Codex for its strong repository awareness and its ability to investigate bugs, modify code, run checks, and prepare focused pull requests.”

Termi Protocol

“Codex was especially useful when I needed a faster coding partner to continue the work while Claude Code was taking longer to respond. Claude Code helped me with the deeper architecture, planning, and product structure, but Codex became a strong assistant for execution. When I needed quick iterations, fixes, or implementation support, Codex helped me keep moving without losing momentum. It also worked really well for the visual generation side of the project. I used it while building the profile system and refining visual-related features. The image generation workflow worked very smoothly, and Codex helped me connect those ideas into the actual product experience.”

WorkClaw

“Gave us comprehensive build and test superpowers.”

Finyuus

“Vibe-coded thru and thru. Impossible to not use Codex for a project like this”