New — Agent Runtime 2.0
Build AI that ships itself.
PROMPT ZERO is the operating system for LLM products. Version prompts, run evals and deploy agents from one calm, blazing-fast workspace.
LIVE
>
✓ routed to sonnet-5
212 ms
$0.0004 / call
48/48 evals passed
INTENT
refund_request
SENTIMENT
−0.62 frustrated
PRIORITY
P1 · escalate
Plugs into the models and stack you already run
[ 01 ] Manifesto
Most AI features die in a notebook. PROMPT ZERO turns fragile prompts into versioned, tested, observable software so your team ships on Friday and sleeps on Saturday.
MK
Mara Kessler
Co-founder & CEO
[ 02 ] Workflow
Three commands from idea to production.
No glue code, no spreadsheets of test cases, no Friday-night hotfixes. PROMPT ZERO gives prompts the same lifecycle as the rest of your code.
Write
Draft prompts in a typed editor with variables, versions and inline diffs your whole team can review.
$
prompt-zero init support-bot
Evaluate
Score every change against golden datasets, LLM judges and custom checks before anything merges.
$
prompt-zero eval --suite golden
Deploy
Ship to the edge with canary rollouts, automatic model fallbacks and one-click rollback.
$
prompt-zero deploy --canary 10%
[ 03 ] Platform
Everything your LLM stack was missing.
sonnet-5
gpt-5
gemini-3-pro
llama-4-70b
mistral-large
fable-5-1
qwen-3
haiku-4.5
o-series
deepseek-v4
command-r+
phi-5
Model router
Send every request to the cheapest model that passes your evals. Automatic fallbacks when a provider hiccups.
accuracy
94%
grounding
88%
tone
97%
latency
72%
Evals on every commit
Golden sets, LLM judges and regex checks run in CI. Regressions never reach users.
Live traces
Every token, tool call and cost, streamed in real time with full replay.
12
13
-
14
+
15
+
16
Prompt diffs & reviews
Branch, diff and review prompts like code. Comment on a single token, approve, merge.
Guardrails built in
PII redaction, jailbreak detection and policy checks on every request, in under 5 ms.
fra-1
11 ms
iad-1
14 ms
sfo-2
9 ms
gru-1
23 ms
sin-1
18 ms
syd-1
21 ms
nrt-1
12 ms
lhr-1
8 ms
Global edge deploys
Canary rollouts to 34 regions with instant rollback. Your users never wait on a cold start.
[ 04 ] Integrations
Every model. One interface.
Swap providers with a config change, not a rewrite. PROMPT ZERO speaks every major model API, vector store and tool protocol out of the box.
40+ models across 12 providers
MCP tools and function calling
Bring your own keys or use ours
99.99
%
API uptime, last 12 months
4.2
B
Tokens routed every month
−38
%
Average LLM spend after 30 days
[ 05 ] Wall of love
Loved by teams who ship on Fridays.
“We replaced four internal tools and a 2,000-row eval spreadsheet in one sprint. Our prompt regressions went to zero.”
PR
Priya Raman
Staff ML Engineer, Northwind
“The model router alone paid for the year. Same quality, a third of the bill.”
JW
Jonas Weber
CTO, Kitelane
“Finally, prompt reviews that feel like code reviews. Product and engineering speak the same language now.”
AL
Ava Lindqvist
Head of AI, Parcelo
“Canary deploys for prompts sound boring until they save your launch. Twice.”
MO
Marcus Oyelaran
Founder, Relaywise
“Traces are absurdly good. I can replay a bad conversation token by token and fix it before lunch.”
SM
Sofia Marín
AI Lead, Brightloop
“Setup took eleven minutes. Our first eval suite ran before the coffee was done.”
DC
Daniel Cho
Engineer, Quillbase
“Guardrails caught a PII leak in staging that three humans missed. That was the day we signed.”
HB
Hannah Becker
Security, Tessaro
“It is the rare dev tool that makes the whole team faster, not just the person who set it up.”
LM
Leo Martins
VP Engineering, Orbitdesk
[ 06 ] Get started
Start at zero. Ship today.
Free for your first 1M tokens. No credit card, no sales call, no nonsense.
psst — the keys are draggable