Purchasing Guides / AI Output Evaluation & Regression Tests

AI Output Evaluation & Regression Tests

A purchasing guide to buying a workflow that checks your AI's answers against your rules and shows what improves or breaks after a change.

Yearly running cost

Assuming 12,000 test cases a year

By hand
$54K / year
1,200 hours of work
Hosted service
$2.4K+ / year
This workflow
$396 / year
Machine usage only; setup, hosting and review are extra.
How should your AI outputs be tested?

Start with saved answers or connect the results from your test pipeline. Compare versions using the same agreed rules.

One test case includes up to 1 saved answer and 5 scoring rules.

Score and report only. Never deploy a model, change production prompts or treat a judge score as a safety guarantee.

What is included

Read saved prompts, answers and reference evidence. Apply your calibrated rules and export a case-level report with version comparisons.

The base scores supplied text outputs and reference evidence. Generating new answers, testing live tools, full red teaming and regulatory certification are separate scopes.

Prompt, answer and reference evidence: up to 2,000 combined words per test case.

How well should the evaluator spot problems?

Choose targets for agreement with experts, missed failures and false alarms. These measure the evaluator, not the AI product's overall accuracy.

How these standards are measured

Calibrate against independent expert labels, then test on held-out outputs. Include known failures, acceptable answers and attempts to manipulate the judge. Missing evidence and tool errors must never become passes.

Targets for your selected standard
What is checkedTarget
Agreement with expert labelsCompare decisions with a separately labelled holdout, not with the judge's own explanations. Balance rule and outcome groups so an easy majority cannot hide errors.≥95%
Known failures detectedCount detected known failures divided by all independently labelled failures. Report per failure type; judge errors count as missed decisions, not successful detection.≥90%
Acceptable answers passedCount correctly passed acceptable cases divided by all acceptable cases. Flagging everything cannot satisfy this measure.≥95%
Complete result recordsRequire case ID, source answer, dataset and rubric version, judge version, outcome and reason or explicit error. Never silently omit failed cases.≥100%

Your team approves the test rules and release decision. A passing score does not establish safety or compliance outside the tested cases.

How quickly should a case be scored?

Choose the time to check a saved answer and return its scores and reasons.

Timing details

Measure all selected scoring rules, queueing, retries and report storage per case. Generating the answer under test and human adjudication are separate.

The target applies to at least 95% of agreed test runs, with 2 in progress at a time.

How much do you want to spend per test case?

Choose the AI budget for scoring a saved answer against your rules.

Cost details

Includes judge-model calls, retries and allocated hosting. Calls that generate candidate answers are separate. Comparing model versions scores each saved answer as its own case.

Reference machine cost: $0.05 – 0.08 per test case at 1000 test cases a month. The selected cap is a target to test, not a replacement for this estimate.

Where do you want it to run?

Choose where the evaluation records live and whether approved test text may go to an external judge model.

Data and access details

Runs in a cloud account you control, with access controls and logs.

Only approved source fields go to the selected external model. Agree access and retention first.

Remove secrets and unnecessary personal data before evaluation. Use local files and a private judge for no external calls; connecting a hosted test pipeline needs network access.

How do you want to use it?

Read a results page, ask your existing agent to evaluate outputs or use a dedicated evaluation agent.

Anything else your provider should know?

Optional. Your choices are included automatically.

Common questions

Why not install an evaluation library myself?

You can. Custom work is useful when you need tested rules for your specific application, a labelled holdout and a results workflow your team can use.

Does the evaluator prove my AI is accurate?

No. It tests the cases and rules you agree. First check that the evaluator agrees with independent experts, then use it to compare your application's outputs.

Does the running cost include generating answers?

No. This guide prices evaluation of saved answers. Your application pays separately to generate the candidate answers before they are scored.

Can the tests automatically release a new version?

Not in this scope. The workflow produces a report; your team decides whether to release. Agree additional gating and deployment work separately.

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