A model-upgrade safety net for your prompts
Every new model release silently breaks carefully tuned prompts. prompt-vault version-controls your prompts, runs regression tests against new model versions, and flags exactly which ones degraded — before your users notice.
Free tier: 1 project, 20 prompts. No card required.
Silent breakage
A model upgrade reformats JSON or drops a field. Your parser fails in prod, not in review.
No version history
Prompts live in scattered code, Notion, and Slack. Nobody knows what changed or why.
No regression gate
You can't tell which prompts a new model degraded until a customer files a bug.
Version, test, and ship prompts with confidence
Three things every team needs the day a new model lands.
Git-style versioning
Every prompt is a tracked artifact with immutable versions, notes, and diffs. Roll back instantly when an edit regresses.
Regression test suites
Attach deterministic assertions — valid JSON, required keys, length bounds, forbidden phrases. They run in milliseconds, no API keys needed.
Model-upgrade safety net
The day a new model drops, re-run your whole suite against old vs new and get a precise list of what degraded — the regressions, not just the diffs.
How the safety net works
- 1
Store prompts
Add your prompts to a project. Each gets versioned automatically.
- 2
Define the contract
Attach assertions describing what a correct output must always do.
- 3
A new model lands
GPT-5.6 preview ships. prompt-vault re-runs every prompt old vs new.
- 4
Get the diff
See exactly which prompts regressed, with the failing assertion highlighted.
Simple, revenue-fair pricing
Start free. Upgrade when the safety net pays for itself in one caught regression.
Don't let the next model release break you.
Check a prompt in 30 seconds — no signup. Then put your whole suite under the safety net.
Run the free checker →