Inspect AI vs OpenAI Evals
Both are alternatives to Braintrust. Here's how they stack up — verified facts, no spin.
Also searched as OpenAI Evals vs Inspect AI — same comparison, one verdict.
Both are llm evaluation & testing tools with the same broad shape, but Inspect AI scores 93 against OpenAI Evals's 85 on data ownership and exit cost — the gap is in how easily you could leave.
Inspect AI
The rigorous one, from the UK AI Safety Institute.
Inspect is the evaluation framework built by the UK AI Safety Institute for evaluating frontier models, released MIT. It is the most methodologically serious option here: first-class support for multi-turn agent evaluations, tool use, sandboxed execution and human grading, with a design that takes statistical validity seriously rather than producing a number that feels reassuring. If your evaluations need to withstand scrutiny — regulatory, academic or internal — this is the one.
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.
| Inspect AI | OpenAI Evals | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 93 | 85 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | MIT | MIT |
| Pricing | Free, MIT, publicly funded. | Free, MIT. You pay for whatever model API the evals call. |
Inspect AI 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 →
Inspect AI
Strengths
- +Built for evaluations that have to survive real scrutiny
- +Strong agent, tool-use and sandboxed-execution support
- +Excellent log viewer for inspecting individual samples
- +MIT, from a public institute with no commercial upsell
Trade-offs
- −Aimed at model evaluation more than application regression testing
- −Steeper learning curve than Promptfoo for simple cases
- −Less oriented toward CI gating out of the box
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 Inspect AI
if a lower exit cost matters more to you than any single feature, and built for evaluations that have to survive real scrutiny.
Choose OpenAI Evals
if large registry of existing benchmark evaluations.
Neither, yet
if both carry a real cost you should weigh first — aimed at model evaluation more than application regression testing, 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.
Inspect AI vs OpenAI Evals — common questions
Is Inspect AI a better fit than OpenAI Evals for llm evaluation & testing?
It depends on what you are optimising for, and the honest split is this: Inspect AI scores 93 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?
Inspect AI 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 Inspect AI 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 Inspect AI 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.