Table of contents
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Efficiency
Codex CLI allows developers to generate code snippets quickly, improving productivity and reducing the time spent on manual coding tasks.
Ease of Use
With natural language processing capabilities, Codex CLI allows users to interact with the tool using simple commands, making it accessible even for those with limited programming knowledge.
Integration
Codex CLI can be integrated into various development environments, allowing seamless transition between AI-assisted coding and traditional coding workflows.
Iterative Feedback
The CLI provides immediate feedback on code input, which helps developers quickly understand and iterate on their implementations.
Versatility
Codex CLI supports a wide range of programming languages and paradigms, making it useful in diverse coding scenarios.
OpenAI Codex CLI is a solid open-source tool that brings AI-powered coding assistance directly into your terminal, making it a compelling choice for developers who want to automate coding tasks, generate code, and interact with their codebase using natural language.
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The latest comments about OpenAI Codex CLI on Reddit. This can help you find out how popualr the product is and what people think about it.
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 / 14 days ago
Codex is open source: https://github.com/openai/codex. - Source: Hacker News / about 1 month ago
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 / about 1 month ago
>kimi has been particularly shameless in copying codex 1:1, wow. Isn´t codex MIT https://github.com/openai/codex ? - Source: Hacker News / about 1 month ago
> a huge value is the […] Codex harness Codex. There are open source implementations Like Codex https://github.com/openai/codex. - Source: Hacker News / about 2 months ago
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 / about 2 months ago
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 / 2 months ago
The next obvious step was installing Codex. Not only for working on projects, but also for managing the server itself. - Source: dev.to / 2 months ago
Codex is open source https://github.com/openai/codex/ it's definitely geared towards openai but it is completely open source. - Source: Hacker News / 2 months ago
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 / 2 months ago
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 / 3 months ago
Codex is open source if you’re interested https://github.com/openai/codex. - Source: Hacker News / 4 months ago
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 / 4 months ago
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 / 4 months ago
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 / 5 months ago
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 / 5 months ago
You may have mistaken it with Codex https://github.com/openai/codex. - Source: Hacker News / 5 months ago
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 / 5 months ago
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 / 7 months ago
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 / 7 months ago
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 / 7 months ago
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