Lumen Labs — Cloud AI, Illuminated
The workspace where product teams design, test, and ship AI features without babysitting infrastructure. Built for the era of agentic software.
Start free trialWhy Lumen Labs
We started Lumen Labs in 2024 after watching too many great AI prototypes die on the way to production. The gap between a cool demo and a reliable feature is enormous, and most of it is plumbing: evals, versioning, prompt drift, cost controls, latency budgets.
Lumen is the workspace that closes that gap. Design prompts with your team, run evals on every change, deploy behind feature flags, and watch real usage roll in — all without touching a single YAML file. Our customers ship 3x faster and sleep 3x better.
Watch the 90-second product tour
Features
Prompt Studio
Version, diff, and review prompts like code. Branch, merge, and roll back — your team will wonder how they ever lived without it.
Instant Evals
Run regression suites on every prompt change. Catch quality drops before your users do, not after.
Safety Rails
Built-in jailbreak detection, PII scrubbing, and content classifiers. Ship to regulated industries with confidence.
Cost & Latency Tracking
Per-request telemetry broken down by prompt, model, and customer. Find the $4,000 prompt before it finds you.
Multi-Model Router
Route between GPT, Claude, Gemini, and your own fine-tunes with a single config. Swap models without redeploying.
SOC 2 & HIPAA Ready
Single tenant deployments, encryption at rest, and audit logs on everything. Enterprise from day one.
Screenshots
3.1x
Faster shipping
42M
Requests / day
99.97%
Uptime SLA
180+
Teams onboard
Gallery
Nimbus Health cut LLM spend 62%
Forge Legal shipped 4 AI features in Q1
Atlas EdTech reduced hallucinations 8x
Kepler Finance moved 100% to multi-model
Vela Travel automated tier-1 support
Helix Bio accelerated literature review
Orbit Gaming built an in-game concierge
Marble Retail personalized every PDP
Pricing
Starter
$0
For tinkerers and side projects
- ✓1 workspace
- ✓10,000 requests/month
- ✓Community Discord
- ✓Prompt Studio (1 branch)
- ✓Basic evals
Team
$199/mo
For product teams shipping AI features
- ✓5 workspaces
- ✓2M requests/month
- ✓Unlimited prompt branches
- ✓Full eval suite
- ✓Cost & latency analytics
- ✓Slack alerts
- ✓Email support
Enterprise
Custom
For regulated & high-volume workloads
- ✓Unlimited workspaces
- ✓Volume pricing
- ✓Single-tenant VPC
- ✓SOC 2 + HIPAA
- ✓SSO / SAML / SCIM
- ✓Dedicated CSM
- ✓24/7 on-call
- ✓99.99% uptime SLA
Testimonials
Lumen paid for itself in six weeks. We caught a prompt regression that would have misrouted 40,000 patient messages. That alone justified the contract.
Priya Raman
Head of AI, Nimbus Health
I have never seen a team adopt a tool this fast. Within a month our prompts were versioned, evaluated, and on-call friendly. Total game changer.
Dmitri Volkov
Staff Engineer, Kepler Finance
We went from launching one AI feature a quarter to launching one a month. The eval harness is worth the whole price tag.
Amara Okafor
CPO, Atlas EdTech
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Our Team
Elena Marquez
Co-founder & CEO
Previously led platform at a top-tier LLM lab. Once shipped a prompt at 3 AM that took down a whole region. Never again.
Tobias Lindqvist
Co-founder & CTO
Distributed systems nerd. Built evaluation pipelines for models you use every day. Believes evals are the new tests.
Naomi Feldman
Head of Product
Shipped developer tools at three startups and one big co. Obsessed with the first 60 seconds of a product experience.
Rahul Deshpande
Head of Research
PhD in ML safety. Writes the papers everyone else cites. Keeps the company honest about what models can and cannot do.
Sponsors
Schedule
Week 1
Kickoff & workspace setup
Your Lumen CSM
We provision your workspace, import existing prompts, and connect your model providers.
Week 2
Eval harness onboarding
Solutions Engineer
Bring your test cases. We help you define golden sets and wire up regression checks for every prompt change.
Week 3
Production rollout
Your team
Feature flag your first prompt through Lumen. We monitor together for the first 48 hours.
Week 4
Cost & safety review
Lumen + your team
Walk through telemetry, find the top 3 cost wins, and tune safety rails for your domain.
Ongoing
Quarterly business review
Your CSM
Review adoption, upcoming features, and roadmap requests.
FAQ
Which models does Lumen support?▾
Everything popular — OpenAI, Anthropic, Google, Mistral, Cohere, Llama variants, and your own fine-tunes via a provider adapter. Adding a new provider takes roughly a day.
Do you store our prompts or responses?▾
By default we store prompts and a sampled subset of responses for evals and debugging. Enterprise customers can disable storage entirely or bring their own encryption keys.
How is Lumen different from a prompt management library?▾
Libraries give you version control. Lumen gives you version control, evaluation, safety, observability, and a UI your PMs and designers can actually use. It is a workspace, not a library.
Can we self-host?▾
Enterprise customers get a single-tenant VPC deployment in AWS, GCP, or Azure. Fully air-gapped installs are available on request.
Do you have a free tier?▾
Yes. The Starter plan gives you 10,000 requests per month and a single workspace, forever. No credit card required.
How do you price requests?▾
A request is a single call to a model through Lumen, regardless of model size. You are still billed separately by your model provider for tokens used.
Try it without signing up
These buttons hit our public demo endpoints. They are rate limited and safe to click — pure read-only calls.
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Ship AI features your team can actually trust
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