OpenAI Codex CLI Reviews and Details

Is OpenAI Codex CLI good?

Social recommendations and mentions

• 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 / 11 days 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 / 15 days 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 / 19 days 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 / 19 days 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 / 28 days 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 / about 2 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 / 2 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 / 2 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 / 3 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 / 3 months ago

• ForgeCode vs Claude Code: which AI coding agent actually wins?

  So I started looking at alternatives. OpenAI has Codex CLI but I haven't tried the harness yet, just the models. The TermBench 2.0 leaderboard is what caught my eye. ForgeCode at #1 with 81.8%. Claude Code at 58%, ranked #39. I installed ForgeCode that same day. - Source: dev.to / 3 months ago

• Claude Code's source code has been leaked via a map file in their NPM registry

  You may have mistaken it with Codex https://github.com/openai/codex. - Source: Hacker News / 4 months ago

• MCP-Manticore: Let Your AI Assistant Write Manticore Queries for You

  MCP-Manticore works with any MCP-compatible AI assistant, including Cursor, Claude Code, Codex CLI, Windsurf, and any other tool that supports the Model Context Protocol. - Source: dev.to / 4 months ago

• octorus: A Rust-built TUI tool where AI autonomously reviews & fixes code while you browse PR diffs

  Both Claude and Codex are launched in headless mode. This means Claude Code or Codex CLI must be installed on your machine. Personally, I use Codex as the reviewer and Claude Code as the reviewee. - Source: dev.to / 5 months ago

• Cloning a 90s DOS Game with AI

  Since I've been running a lot of AI-agent experiments lately, I wanted to see how far I could get building a game just by using prompts alone (aka vibe coding). For this experiment I used OpenAI Codex CLI with the GPT-5.2 Codex model (high thinking mode). - Source: dev.to / 6 months ago

• Unrolling the Codex Agent Loop

  The best part about this blog post is that none of it is a surprise – Codex CLI is open source. https://github.com/openai/codex. - Source: Hacker News / 6 months ago

• Beads – A memory upgrade for your coding agent

  Claude Code doesn't do anything with semantic search or embeddings out of the box. They use a simple grep tool instead. Neither does OpenAI's Codex CLI - you can confirm that by looking at the source code https://github.com/openai/codex Cursor and Windsurf both use semantic search via embeddings. You can get semantic search in Claude Code using this unofficial plugin: https://github.com/zilliztech/claude-context. - Source: Hacker News / 8 months ago

• Codex: Most Common Issues and Feature Requests

  This summary is based on research into issues and feature requests in the GitHub repository https://github.com/openai/codex. - Source: dev.to / 9 months ago

• From Beginner to Codex CLI Pro

  Reminder that Codex is open source. Best way to improve is to look at the latest commits/releases. If you want more Codex tips you can follow me on X/Twitter here: andyrewlee. - Source: dev.to / 9 months ago

• Building a Rust API with Claude Sonnet 4.5

  Sonnet has proven itself to be very powerful and capable of handling complex tasks, but lately the community were claiming that Claude is slowly getting worse and it's not as good as it first was. This is especially after OpenAI released their leading coding model Codex model for their open source Codex CLI. - Source: dev.to / 10 months ago

• No “resume” in Codex CLI, so I built one: quickly “continue” with `codex-history-list`

  Codex CLI is an AI coding agent that runs in your terminal, but there’s still no official “resume” feature. - Source: dev.to / 11 months ago