One API key.
Every AI model.
Reach 248+ models from OpenAI, Anthropic, Google, DeepSeek and more through one endpoint. Use them in your code and agents, or chat right here. Pay only for what you use.
from openai import OpenAI
client = OpenAI(
base_url="https://lumen-api.develse.com/v1",
api_key="YOUR_API_KEY",
)
reply = client.chat.completions.create(
model="claude-haiku-5-5",
messages=[{"role": "user", "content": "Hello!"}],
)Works with any OpenAI SDK. Just change the base URL.
Start in three steps.
From sign-up to your first request in a few minutes.
Sign up
Create an account in under a minute. No credit card needed to start.
Top up or subscribe
Begin with the free models. Top up or pick a plan when you need paid ones. Pay-as-you-go credit never expires.
Get your API key
Use it in your code, in Claude Code, or paste it into SillyTavern, RisuAI, or any OpenAI-compatible AI chat client.
sk-••••••••••••••••••••••••Built for production.
Everything you need to ship AI features without juggling providers, keys and invoices.
Drop-in compatible
OpenAI, Anthropic and Gemini formats. Point your SDK at Lumen and keep your code.
Automatic failover
When a provider slows down or fails, requests move to a healthy one. No retry logic to write.
Pay as you go
Clear per-token prices, free models to start, and credit that never expires.
Keys with limits
Create a key per project and cap it with model allow-lists, spending limits and expiry dates.
Usage analytics
Spend, latency and success rate per model and per key, for any date range.
Private chat
The built-in chat keeps your conversations in your browser, not on our servers.
Works with the tools you already use.
Coding agents, character chat apps, desktop clients and CLI tools. Add Lumen as a custom OpenAI-compatible provider in a minute.
Reporting in, recruit. Stow your gear, we jump in ten.
Rather just chat?
It's built in.
Open the chat and start talking. Free models are ready with no sign-up and no setup. Bring characters, personas and lorebooks, and keep every conversation in your browser.
Free models are ready to go. Open the page and start chatting, no account needed.
Personas, presets, prompt templates, and SillyTavern card import built in.
Conversations live in your browser, never on our server. Bring your own OpenAI-compatible endpoint and key too, fired straight from the browser.
Lorebooks, group chats and swipes: a complete character chat engine.
Start building with Lumen
Create a free account, copy your key and make your first request in under a minute.