Regression testing for LLM agents

Know when your support agent breaks — before your customers do.

Testpath re-runs your agent's eval against your real scenarios and applies real statistics — a stable red/green in CI that tells a genuine regression from model noise, and won't fail your build on a flaky run.

Request early access How it works ↓

For teams running a customer-facing LLM agent in production.

You tweak a prompt, ship it, and don't notice the refund flow quietly broke. “It worked when I tested it” isn't a test — especially when the same input can give a different answer every run.

See it

Same change, run twice. Testpath catches a real regression a single-run eval calls “passing” — then shrugs off noise it would have false-flagged.

testpath run

testpath catching a real regression, then dismissing run-to-run noise

Regression caught

a 0.91 → 0.78 drop a single run would miss

Noise ignored

inside run-to-run variance — not a fail

≈ $5 a run

sequential stopping, not brute force

What you get

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Stable verdicts, not coin flips

Every check runs many times and gets a real statistical verdict — so a flaky model doesn't read as a failure, and a real regression doesn't hide in the noise.

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Catch silent regressions

Know the moment a prompt, model, or tool change degrades your agent — caught in your CI before it ships, not from an angry customer after.

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Reliability over time

A running red/green history of your agent, so you can see the trend — not just whether it works today.

How we're different

Plenty of tools run your eval. The gap is what happens next — most hand you a number and leave you guessing whether it really moved.

The usual way

Runs each check once
Hands you a raw score to interpret
Can't tell a real regression from model noise
A dashboard you check after the fact
Brute-force reruns, or you hand-roll it

Testpath

Runs each check many times, adaptively
A clear pass · fail · flaky, with confidence
Tells a real regression from model noise
A red/green gate that blocks the bad merge
Cost-aware — stops early once it's sure

Testing an agent in production?

We're onboarding a handful of design partners. If you run a support agent and silent regressions scare you, let's talk.

Request early access