Ragas vs OpenAI Evals
Both are alternatives to Braintrust. Here's how they stack up — verified facts, no spin.
Also searched as OpenAI Evals vs Ragas — same comparison, one verdict.
Ragas and OpenAI Evals are closely matched on ownership (92 vs 85) — this one comes down to pricing and to which trade-offs below you can live with.
Ragas
Purpose-built RAG evaluation — measures retrieval and generation separately.
Ragas evaluates RAG systems specifically, and its central insight is that retrieval failure and generation failure need separate measurement. Context precision and recall tell you whether the retriever found the right material; faithfulness and answer relevancy tell you whether the model used it honestly. Without that separation you know the answer was wrong but not which half to fix. Apache-2.0, and it composes with LlamaIndex and Haystack directly.
OpenAI Evals
The original benchmark harness. Simple, standard, still useful.
OpenAI Evals is the framework and registry that popularised systematic LLM evaluation. It provides a standard harness for running benchmark-style evaluations and a public registry of existing ones, so comparing against a known suite is a command rather than a project. It is less actively developed than the others here and less suited to application-level regression testing, but for running or extending a standard benchmark it remains the shortest path. MIT licensed.
Side by side
6 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Ragas | OpenAI Evals | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 92 | 85 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | Apache-2.0 | MIT |
| Pricing | Free, Apache-2.0. | Free, MIT. You pay for whatever model API the evals call. |
Ragas edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Braintrust? Is Braintrust free? What it actually costs →
Ragas
Strengths
- +Separates retrieval quality from generation quality
- +Can generate a synthetic test set from your own documents
- +Integrates directly with LlamaIndex and Haystack
- +Apache-2.0
Trade-offs
- −RAG-specific — not a general evaluation framework
- −Judge-model calls make large suites cost real money
- −Metric scores need calibration before you trust them
OpenAI Evals
Strengths
- +Large registry of existing benchmark evaluations
- +Simple, well-understood format that many teams already know
- +Straightforward to extend with your own cases
- +MIT licensed
Trade-offs
- −Development pace has slowed relative to the alternatives
- −Oriented to benchmarks, not application regression testing
- −Weaker RAG and agent evaluation support than the others
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Ragas
if a lower exit cost matters more to you than any single feature, and separates retrieval quality from generation quality.
Choose OpenAI Evals
if large registry of existing benchmark evaluations.
Neither, yet
if both carry a real cost you should weigh first — rAG-specific — not a general evaluation framework, and development pace has slowed relative to the alternatives. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
Ragas vs OpenAI Evals — common questions
Is Ragas a better fit than OpenAI Evals for llm evaluation & testing?
It depends on what you are optimising for, and the honest split is this: Ragas scores 92 to OpenAI Evals's 85 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. OpenAI Evals earns its place on a different axis — large registry of existing benchmark evaluations. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Ragas keeps its data local or in open formats, so leaving is an export rather than a negotiation. OpenAI Evals is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host Ragas or OpenAI Evals?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are Ragas and OpenAI Evals both alternatives to Braintrust?
Yes — both appear in our Braintrust comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Braintrust and now choosing between the two replacements, which is a narrower and much easier question.
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Facts verified 2026-08-11. Licenses and pricing change — spotted something out of date? That's a correction we want.