OpenAI Codex CLI Reviews and Details

Social recommendations and mentions

• Ask HN: Has anyone decompiled Claude Code yet?

  For Codex there is no need to decompile because unlike Claude Code, Codex is open source [1] and written in Rust. There are lot of other amazing open source agent harnesses like OpenCode [2] and Pi [3]. [1] https://github.com/openai/codex [2] https://github.com/anomalyco/opencode [3] https://github.com/earendil-works/pi. - Source: Hacker News / 2 days ago

• Codex Mobile App Automation: Delegating Android UI Tasks via Skill Files

  When you run OpenAI Codex CLI or Claude Code (verified October 14, 2026) inside a repository, the agent has full access to your local shell, file tree, and HTTP clients. That works for backend services and web apps that can be driven through Playwright, but three common engineering and operations tasks still live exclusively inside mobile apps:. - Source: dev.to / 4 days ago

• Stop trusting vibes: how we built an eval harness for Expo's agent skills

  That was the gap we had at Expo. We bundle our agent skills into one plugin for Claude Code and Codex, covering native interfaces, navigation, data fetching, animations, Expo Modules, and our cloud services. We kept adding skills and polishing descriptions, but we had no real signal on whether any of it was landing. So we built an eval harness with Georgian AI Lab, wired it into CI, and used it to find a problem... - Source: dev.to / 10 days ago

• AI Is a Tool. Using It Well Takes Skill.

  > It’s a shame I cannot inspect the tool. It’s a shame I cannot modify it as I see fit. https://github.com/openai/codex https://github.com/MoonshotAI/kimi-code https://github.com/mistralai/mistral-vibe https://github.com/earendil-works/pi https://claude.com/de/resources/articles/claude-code-mods. - Source: Hacker News / 6 days ago

• Claude Code vs Codex: Stop Picking a Side, Start Picking a Task

  Codex takes the opposite bet: one product across six surfaces. CLI, IDE extension, Codex Cloud, the ChatGPT app sidebar, mobile (GA May 2026), and a Chrome extension. All of them share your ChatGPT account, your session history, and your AGENTS.md config. You can start a refactor on your phone during a commute, pick it up in VS Code at your desk, and review the PR from the Chrome extension without losing state.... - Source: dev.to / 16 days ago

• Track AI Token Spend in Grafana: Claude, Codex, and Ollama

  The second CLI (Codex) records tokens and quota in session files, but the laptop sleeps and moves, so Prometheus can't reliably scrape it. That's exactly the Pushgateway case: a systemd user timer parses the session files every 5 minutes and pushes lifetime totals plus quota percentage to :9091. - Source: dev.to / about 1 month ago

• Asana cleared 5 years of engineering work in 2 weeks with Codex

  Since when? https://learn.chatgpt.com/docs/codex/cli https://github.com/openai/codex Looks like it's still a more-or-less-open-source product called Codex CLI. FWIW, there have been issues with various versions of ChatGPT not knowing what Codex is -- at least in the (IIRC) GPT-5.3 timeframe, there were serious issues with the knowledge cutoff. - Source: Hacker News / about 2 months ago

• Qwen3.8-Max: A New Bar for Coding and Cowork

  Codex is open source: https://github.com/openai/codex. - Source: Hacker News / 3 months ago

• The Coding Agent I Could Shape Around My Workflow

  One of the first things I asked Pi was whether it could show my OpenAI usage limits in its status line. It replied that it should be possible with the Codex CLI. - Source: dev.to / 3 months ago

• Kimi Work

  >kimi has been particularly shameless in copying codex 1:1, wow. Isn´t codex MIT https://github.com/openai/codex ? - Source: Hacker News / 3 months ago

• Kimi K3, Qwen 3.8, and Anthropic's (Potential) Unravelling

  > a huge value is the […] Codex harness Codex. There are open source implementations Like Codex https://github.com/openai/codex. - Source: Hacker News / 3 months ago

• GPT 5.6

  Test-drive it with Pro (5x or 20x) for a month. Download the Codex CLI client from https://github.com/openai/codex and auth it in the browser via the URL it provides. Set the model to 5.6-Sol and effort to max. - Source: Hacker News / 3 months ago

• GPT-5.5 Codex reasoning-token clustering may be leading to degraded performance

  OpenAI doesn't require that; only Anthropic does. OpenAI's harness is fully open source[1], and (AFAIK) doesn't come with any kind of signed-build request integrity verification like Claude does. And by that logic, if you're allowed to use their API with a fork of Codex that you yourself compiled, there's nothing stopping you from making some other harness act like such a fork. [1] https://github.com/openai/codex. - Source: Hacker News / 4 months ago

• I turned my old gaming PC into a Linux server

  The next obvious step was installing Codex. Not only for working on projects, but also for managing the server itself. - Source: dev.to / 4 months ago

• ZCode: Claude Code from the Makers of GLM

  Codex is open source https://github.com/openai/codex/ it's definitely geared towards openai but it is completely open source. - Source: Hacker News / 4 months ago

• Codex logging bug may write TBs to local SSDs

  Well, everyone's bashing on OpenAI as well they should, but just a reminder, unlike Claude Code, Codex is officially available to customize here: https://github.com/openai/codex It's fairly easy to patch. - Source: Hacker News / 4 months ago

• Run OpenAI Codex CLI on Claude, Gemini, or Llama — in 50 lines of C#

  OpenAI's Codex CLI ships with a great editor-agent UX: shell tool, apply_patch, plan tracking, the lot. The catch — as of February 2026 it only speaks the OpenAI Responses API. Chat Completion support was dropped (codex-rs/model-provider-info/src/lib.rs: the WireApi enum has one variant, Responses). If you wanted to point it at a Chat-Completion-only endpoint — Ollama, LM Studio, your favorite Llama runner —... - Source: dev.to / 5 months ago

• How Claude Code works in large codebases

  Codex is open source if you’re interested https://github.com/openai/codex. - Source: Hacker News / 5 months ago

• Tokenmaxxing: Codex + Claude Code Operator Stack 2026

  This is also the story behind Codex itself climbing onto the GitHub trending board this week (#10 blip, 367 stars). The repo trending alongside addyosmani/agent-skills isn't a coincidence — it's a market signal that operators are pulling Codex into stacks where Claude Code already lives. - Source: dev.to / 5 months ago

• zot - Why I Built Another coding agent harness?

  I've used several coding harnesses before, and much of this space is genuinely impressive and excellent: pi (my big love and most used), OpenCode, and of course Claude Code, Codex and the manufacturers' things. - Source: dev.to / 6 months ago

• Beyond CLAUDE.md and AGENTS.md: when your coding agent needs a behavior spec

  AGENTS.md does the same for Codex and other agents: coding conventions, build commands, architecture patterns, file organization rules. OpenAI's AGENTS.md spec has been adopted across tens of thousands of repos because it solves the "how to work here" problem well. - Source: dev.to / 6 months ago