Promptfoo vs OpenAI Codex
A side-by-side comparison to help you choose the right tool.
88
Promptfoo scores higher overall (88/100)
But the best choice depends on your specific needs. Compare below.
| Feature | Promptfoo | OpenAI Codex |
|---|---|---|
| Our score | 88 | 86 |
| Pricing | Open-source core; free to run in your own workflows. | Access depends on OpenAI product plan or API usage; advanced agent access is concentrated in higher tiers and previews. |
| Free plan | Yes | Yes |
| Best for | Teams serious about AI testing discipline, Developers comparing prompts and providers, Organizations building evals into release workflows | 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 | mac, windows, linux, api | web, mac, windows, linux, api |
| API | Yes | Yes |
| Languages | en | en |
| Pros |
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| Cons |
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| Visit site | Visit site |
- Pricing
- Open-source core; free to run in your own workflows.
- Free plan
- Yes
- Best for
- Teams serious about AI testing discipline, Developers comparing prompts and providers, Organizations building evals into release workflows
- Platforms
- mac, windows, linux, api
- API
- Yes
- Languages
- en
- 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
88Choose Promptfoo if:
- You are Teams serious about AI testing discipline
- You are Developers comparing prompts and providers
- You are Organizations building evals into release workflows
- You want to start free
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
FAQ
- What is the difference between Promptfoo and OpenAI Codex?
- Promptfoo is an open-source testing and evaluation framework for prompts and models, designed to fit into ci/cd and comparison workflows. OpenAI Codex is openai's coding agent experience for writing, editing, understanding, and operating on codebases with a more agentic workflow.
- Which is cheaper, Promptfoo or OpenAI Codex?
- Promptfoo: Open-source core; free to run in your own workflows.. OpenAI Codex: Access depends on OpenAI product plan or API usage; advanced agent access is concentrated in higher tiers and previews.. Promptfoo has a free plan. OpenAI Codex has a free plan.
- Who is Promptfoo best for?
- Promptfoo is best for Teams serious about AI testing discipline, Developers comparing prompts and providers, Organizations building evals into release workflows.
- 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.