What are Codex's verified plans?

Codex lists Free $0/month, Go $8/month, Plus $20/month, Pro 5x $100/month, and Pro 20x $200/month. Business / Enterprise pricing is not published. With API Key, payment is based on the tokens Codex uses and API pricing.

Which platforms are listed?

Codex lists web, mac, win, linux, cli, and vscode-ext. Persona.js platforms are not recorded.

Can Codex use Claude or Gemini?

No. Codex is locked to OpenAI's GPT models, with no Claude or Gemini available out of the box.

Codex vs Persona.js: How They Actually Differ

Codex suits developers who want an OpenAI coding agent across the terminal, IDE, desktop, and cloud, including GitHub pull-request review. Persona.js suits developers who want to add WebMCP-native AI chat to a frontend through a JavaScript library. Codex has a recorded free entry plan; Persona.js pricing is not recorded.

Compiled 2026-10-20 from our catalogue entries for Codex and Persona.js.

The short answer

Pick Codex if: You want coding work across a terminal CLI, IDE extension, desktop app, or cloud, and you are comfortable using OpenAI GPT models. Codex also provides cloud review for GitHub pull requests.
Pick Persona.js if: You want to add AI chat to a frontend through a JavaScript library and can work with browser-side WebMCP support that is not yet broadly standardized.
Cheapest way in: Codex lists Free at $0/month as its starting option. Persona.js has no recorded starting price or pricing model, so its cost cannot be compared.
What we could not compare: Persona.js pricing, starting price, and platforms are not recorded, and it has no verified plans, docs, or public repo listed. Codex lists platforms and verified prices, but docs and a public repo are also not listed for either product.

Codex is OpenAI's agentic coding tool, with the same agent available in a terminal CLI, IDE extension, desktop app, and cloud environment. It reads AGENTS.md, speaks MCP, and can run a cloud review on a GitHub pull request that comments inline and proposes fixes.

Persona.js is a JavaScript library for adding AI chat to a frontend through a WebMCP-native implementation. Its WebMCP support depends on browser-side implementation that is not yet broadly standardized. Its pricing model and starting price are not recorded, and no verified plans are on file.

Side by side

Every cell is a field on our catalogue entry for that tool, copied as recorded. Rows where the two differ come first; blank fields say so rather than being filled in.

	Codex	Persona.js
Pricing model	Freemium	Not recorded
Starts at	Free — $0 /month	Not recorded
Runs on	web, mac, win, linux, cli, vscode-ext	Not recorded
Category	AI Coding Agents	AI Coding Agents
Public source code	No public repo listed	No public repo listed
Public docs	Not listed	Not listed

Public source code: From the repository link on each catalogue entry, not a licence audit.

Where Codex is the better fit

Runs the same agent across CLI, IDE, desktop, and cloud, allowing work to continue between surfaces.
Can review a GitHub pull request in the cloud, comment inline, and propose fixes.
Reads AGENTS.md and supports Model Context Protocol tools.

Full Codex entry · Codex pricing, verified

Where Persona.js is the better fit

Adds AI chat functionality to any frontend through a JavaScript library.
Uses a WebMCP-native implementation for web chat.
Is intended for developers integrating a library into their own frontend rather than using a hosted widget or separate service.

Full Persona.js entry

Which one should you pick?

Solo founder or small team wanting coding work across several development surfaces

Codex

It runs one agent across CLI, IDE, desktop, and cloud and can review GitHub pull requests. Its verified entry plan is Free at $0/month.

Developer adding AI chat to a frontend they control

Persona.js

It is a JavaScript library with a WebMCP-native implementation. The recorded caveat is that browser-side WebMCP support is not yet broadly standardized.

Frequently asked questions

What are Codex's verified plans?: Codex lists Free $0/month, Go $8/month, Plus $20/month, Pro 5x $100/month, and Pro 20x $200/month. Business / Enterprise pricing is not published. With API Key, payment is based on the tokens Codex uses and API pricing.
What does Persona.js cost?: Persona.js's pricing model and starting price are not recorded, and no verified plans are on file.
Which platforms are listed?: Codex lists web, mac, win, linux, cli, and vscode-ext. Persona.js platforms are not recorded.
Can Codex use Claude or Gemini?: No. Codex is locked to OpenAI's GPT models, with no Claude or Gemini available out of the box.
What is the main caveat for Persona.js?: Its WebMCP support depends on browser-side implementation that is not yet broadly standardized.

What we compared

This page states nothing that is not in the two catalogue entries below. The exact text used to write it is reproduced here so you can check our reading, and both tools link through to their own pages and to the vendor.

/tools/codex — checked 2026-07-02 · official site
/tools/persona-js — checked 2026-06-30 · official site

Show the source text

## Codex (/tools/codex)
Tagline: OpenAI's coding agent — works in the terminal, IDE, and cloud, reviews GitHub pull requests, and runs on GPT-5 models.
Category: AI Coding Agents
Pricing model: freemium
Starts at: Free — $0 /month
Platforms: web, mac, win, linux, cli, vscode-ext
Public repo: none listed
Docs: none listed
Verified plans (read 2026-08-21): Free $0 /month | Go $8 /month | Plus $20 /month | Pro 5x $100 /month | Pro 20x $200 /month | Business / Enterprise Not published | API Key Pay only for the tokens Codex uses, based on API pricing
Strengths on file: Runs one agent across CLI, IDE, desktop, and cloud — work moves between surfaces.; Strong GitHub integration: a cloud code review on a pull request that catches real bugs and proposes fixes.; Reads the shared AGENTS.md standard and supports MCP tools.; Included with ChatGPT plans, from the free tier up through Pro.
Limits on file: Locked to OpenAI's GPT models — no Claude or Gemini out of the box.; Fewer built-in customization primitives (hooks, sub-agents) than some rivals.
Codex is OpenAI's agentic coding tool. It runs the same agent across a terminal CLI, an IDE extension, a desktop app, and a cloud environment, so work started in one surface can continue in another. It reads the shared AGENTS.md instructions file, speaks the Model Context Protocol (MCP), and can spin up a cloud code review on a GitHub pull request that comments inline and proposes fixes. Codex runs on OpenAI's GPT models — currently GPT-5.5 as the recommended frontier model — and is included with ChatGPT plans, from the free tier up through Pro.

## Persona.js (/tools/persona-js)
Tagline: Add WebMCP-native AI chat to any Frontend
Category: AI Coding Agents
Pricing model: not recorded
Starts at: Not recorded
Platforms: not recorded
Public repo: none listed
Docs: none listed
Verified plans: none on file
Strengths on file: WebMCP-native implementation for AI chat on the web.; Adds AI chat functionality to any frontend via a JavaScript library.
Limits on file: WebMCP support depends on browser-side implementation that is not yet broadly standardized.
Persona JS is a JavaScript library that adds AI chat to any frontend with a WebMCP-native implementation.
Its distinction is the WebMCP-native approach: it drops AI chat into a web frontend through a JS library rather than a hosted widget or separate service.
It's aimed at developers who can integrate a library into their own frontend. Two caveats: its WebMCP support depends on browser-side implementation that isn't yet broadly standardised, and the pricing model isn't publicly listed, so cost is hard to evaluate up front.
Among AI coding-agent tools, Persona JS is a build-it-in library for adding chat to your own site, rather than a standalone agent or IDE assistant.

Change log

2026-10-20 — First published, compiled from the catalogue entries for Codex and Persona.js.