Codex vs Skybridge: How They Actually Differ
Codex is an AI coding agent that runs across terminal, IDE, and cloud, priced from free. Skybridge is an open-source React framework for building MCP Apps, with no published pricing. Pick Codex if you want a coding agent; pick Skybridge if you want to build MCP Apps.
Compiled 2026-09-01 from our catalogue entries for Codex and Skybridge.
The short answer
- Pick Codex if
- you want an AI coding agent that runs the same agent across CLI, IDE, desktop, and cloud, reviews GitHub pull requests, and starts at a free tier.
- Pick Skybridge if
- you want an open-source React framework purpose-built for developing MCP Apps, with a full-stack architecture aimed at that protocol.
- Cheapest way in
- Codex's Free plan at $0/month; Skybridge's pricing is not recorded on file, so we cannot name a starting price for it.
- What we could not compare
- Skybridge's pricing, platform support, and plans — none of those fields are on file.
Codex and Skybridge sit in the same category listing but do different jobs. Codex is OpenAI's agentic coding tool: it runs one agent across the terminal, an IDE extension, a desktop app, and a cloud environment, and it reviews GitHub pull requests inline. Skybridge is an open-source React framework that is not a coding agent at all — it is a full-stack toolkit for building MCP Apps, aimed at developers who want a framework shaped around the Model Context Protocol rather than a general web framework.
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 | Skybridge | |
|---|---|---|
| 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
- The same agent runs across CLI, IDE, desktop, and cloud, so work started in one surface can continue in another.
- Cloud code review on a GitHub pull request that comments inline, catches real bugs, and proposes fixes.
- Reads the shared AGENTS.md standard, supports MCP tools, and is included with ChatGPT plans from the free tier up through Pro.
Where Skybridge is the better fit
- Open-source React framework purpose-built for developing MCP Apps.
- Full-stack architecture for building Model Context Protocol applications.
- Runs in web environments, so MCP app development happens in the browser.
Which one should you pick?
Solo developer who wants an AI agent to write code and review pull requests
Codex
It runs the same agent across CLI, IDE, and cloud, reviews GitHub pull requests inline, and has a Free $0/month tier to start.
Solo founder or small team building MCP Apps with React
Skybridge
It is an open-source React framework built specifically for the Model Context Protocol, with a full-stack setup aimed at that ecosystem.
Frequently asked questions
- Does Codex run on non-OpenAI models?
- No. Codex is locked to OpenAI's GPT models — currently GPT-5.5 is the recommended frontier model — and Claude or Gemini are not supported out of the box.
- Is Skybridge's pricing published?
- No. Pricing is not recorded on file, so cost evaluation is not possible from the fact sheet.
- Can Skybridge replace a general React framework?
- The fact sheet says its use cases are narrower than general-purpose React frameworks and that it is limited to web-based environments, so it is a poorer fit for general web work.
- Does Codex support MCP?
- Yes. Codex supports MCP tools and reads the shared AGENTS.md standard.
- What are Codex's published plans?
- Free $0/month, Go $8/month, Plus $20/month, Pro 5x $100/month, Pro 20x $200/month, Business/Enterprise not published, and an API Key option that bills only for the tokens Codex uses.
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/skybridge — checked 2026-06-23 · 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. ## Skybridge (/tools/skybridge) Tagline: The full-stack open source React framework for MCP Apps 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: Skybridge is an open-source React framework purpose-built for developing MCP Apps.; It offers a full-stack architecture for building Model Context Protocol applications.; The framework runs in web environments, enabling browser-based MCP app development.; It targets the Model Context Protocol ecosystem, allowing developers to create MCP-compatible apps. Limits on file: As a framework specifically for MCP Apps, its use cases are narrower than general-purpose React frameworks. Skybridge is an open-source React framework built specifically for developing MCP Apps. It provides a full-stack architecture for building Model Context Protocol applications. Its defining trait is that focus: rather than a general web framework, it is purpose-built for the Model Context Protocol, giving developers a full-stack setup to create MCP-compatible apps. It runs in web environments, so MCP app development happens in the browser. It fits developers building MCP Apps who want a framework shaped around that protocol. It is a poorer fit for general web work, since its use cases are narrower than a general-purpose React framework, and it is limited to web-based environments. Pricing is not publicly disclosed, which makes cost evaluation harder. Compared with general React frameworks, Skybridge trades broad applicability for a full-stack toolkit aimed squarely at the MCP ecosystem.
Change log
- 2026-09-01 — First published, compiled from the catalogue entries for Codex and Skybridge.