OpenAI Codex vs Mastra
A side-by-side comparison to help you choose the right tool.
86
OpenAI Codex scores higher overall (86/100)
But the best choice depends on your specific needs. Compare below.
| Feature | OpenAI Codex | Mastra |
|---|---|---|
| Our score | 86 | 80 |
| Pricing | Access depends on OpenAI product plan or API usage; advanced agent access is concentrated in higher tiers and previews. | Fully open source under MIT license. No cloud fees. Self-hosted on your own infrastructure. |
| Free plan | Yes | Yes |
| Best for | Developers who want AI to work more directly on real code tasks, Teams exploring terminal-first coding agents, Engineers already invested in OpenAI's ecosystem | TypeScript and Node.js developers who want a structured, production-ready agent framework, Teams building internal AI copilots or customer-facing assistants with full code control, Startups embedding AI capabilities into products that need evals and tracing from day one |
| Platforms | web, mac, windows, linux, api | api, web |
| API | Yes | Yes |
| Languages | en | en |
| Pros |
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| Cons |
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| Visit site | Visit site |
- Pricing
- Access depends on OpenAI product plan or API usage; advanced agent access is concentrated in higher tiers and previews.
- Free plan
- Yes
- Best for
- Developers who want AI to work more directly on real code tasks, Teams exploring terminal-first coding agents, Engineers already invested in OpenAI's ecosystem
- Platforms
- web, mac, windows, linux, api
- API
- Yes
- Languages
- en
Mastra
80
- Pricing
- Fully open source under MIT license. No cloud fees. Self-hosted on your own infrastructure.
- Free plan
- Yes
- Best for
- TypeScript and Node.js developers who want a structured, production-ready agent framework, Teams building internal AI copilots or customer-facing assistants with full code control, Startups embedding AI capabilities into products that need evals and tracing from day one
- Platforms
- api, web
- API
- Yes
- Languages
- en
86Choose OpenAI Codex if:
- You are Developers who want AI to work more directly on real code tasks
- You are Teams exploring terminal-first coding agents
- You are Engineers already invested in OpenAI's ecosystem
- You want to start free
80Choose Mastra if:
- You are TypeScript and Node.js developers who want a structured, production-ready agent framework
- You are Teams building internal AI copilots or customer-facing assistants with full code control
- You are Startups embedding AI capabilities into products that need evals and tracing from day one
- You want to start free
FAQ
- What is the difference between OpenAI Codex and Mastra?
- OpenAI Codex is openai's coding agent experience for writing, editing, understanding, and operating on codebases with a more agentic workflow. Mastra is open-source typescript framework for building production-ready ai agents and multi-step workflows, with a local studio ui, typed zod schemas, built-in evals, and support for suspend/resume human-in-the-loop flows.
- Which is cheaper, OpenAI Codex or Mastra?
- OpenAI Codex: Access depends on OpenAI product plan or API usage; advanced agent access is concentrated in higher tiers and previews.. Mastra: Fully open source under MIT license. No cloud fees. Self-hosted on your own infrastructure.. OpenAI Codex has a free plan. Mastra has a free plan.
- Who is OpenAI Codex best for?
- OpenAI Codex is best for Developers who want AI to work more directly on real code tasks, Teams exploring terminal-first coding agents, Engineers already invested in OpenAI's ecosystem.
- Who is Mastra best for?
- Mastra is best for TypeScript and Node.js developers who want a structured, production-ready agent framework, Teams building internal AI copilots or customer-facing assistants with full code control, Startups embedding AI capabilities into products that need evals and tracing from day one.