Dev tools · alternatives · 2026

24 alternatives to openai-codex

openai-codex

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
Codex by OpenAI▲954
OpenAI's smartest and most intuitive to use model yet
2021 · openai.com · its alternatives →
2
CodeX-Editor▲125
A web code editor with AI & multi-language support
2025 · x-codex.vercel.app · its alternatives →
3
Open Codex – OpenAI Codex CLI with open-source LLMs▲106
Hey HN, I’ve built Open Codex, a fully local, open-source alternative to OpenAI’s Codex CLI. My initial plan was to fork their project and extend it. I even started doing that. But it turned out their code has several leaky abstractions, which made it hard to override core behavior cleanly. Shortly after, OpenAI introduced breaking changes. Maintaining my customizations on top became increasingly difficult. So I rewrote the whole thing from scratch using Python. My version is designed to support local LLMs. Right now, it only works with phi-4-mini (GGUF) via…
2025 · github.com · its alternatives →
4
CodeX▲124
Build webapps in minutes for completely free
2025 · its alternatives →
5
Codex CLI▲9
Codex-CLI
2025 · its alternatives →
6
Codex app for Windows▲145
Codex now runs natively on Windows with secure sandbox
Mar 2026 · learn.chatgpt.com · its alternatives →
7
OpenCode Superapp▲128
The power of Codex with local, self-hosted models and voice
Jul 2026 · opencodesuper.app · its alternatives →
8
Codex▲247
Discuss and understand your code base from within your IDE
2022 · usecodex.com · its alternatives →
9
opencode▲393
Your terminal's AI agent, with any model you want
2025 · opencode.ai · its alternatives →
10
GPT‑5.3‑Codex‑Spark▲277
An ultra-fast model for real-time coding in Codex
Feb 2026 · openai.com · its alternatives →
11
Codex Subagents▲300
Parallel custom agents for complex tasks
Mar 2026 · learn.chatgpt.com · its alternatives →
12
Vellum▲413
Build AI agents using plain English to do your boring tasks
Jan 2026 · vellum.ai · its alternatives →
13
AI Text Classifier by OpenAI▲309
New AI classifier for indicating AI-written text
2023 · openai.com · its alternatives →
14
Content Codex▲313
Your brand’s content strategy, enhanced by AI
2024 · its alternatives →
15
PR-Agent by CodiumAI▲390
AI-powered chat & code review
2024 · chromewebstore.google.com · its alternatives →
16
Presenting CODEX-AI▲7
An AI code completion assistant powered by Gemini.
2025 · marketplace.visualstudio.com · its alternatives →
17
Everything OpenAI Codex▲7
An open-source workflow OS for OpenAI Codex.
May 2026 · github.com · its alternatives →
18
Codexy▲13
Lightweight coding agent that runs in your terminal
2025 · github.com · its alternatives →
19
CodeX▲56
Light weight code compiler with an API
2021 · codexweb.netlify.app · its alternatives →
20
OpenAI Open Models▲480
gpt-oss-120b and gpt-oss-20b open-weight language models
2025 · openai.com · its alternatives →
21
Agentation▲428
The visual feedback tool for AI agents
Mar 2026 · agentation.com · its alternatives →
22
Promptly AI▲376
No-code platform for generative AI apps and workflows
2024 · its alternatives →
23
Project Atlas Desktop▲401
Generate no-code agents in natural language
2024 · chromewebstore.google.com · its alternatives →
24
Free AI Writing & Generators Tools▲379
Your ultimate assistant for content creation
2024 · embedai.webflow.io · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →