AI API — one key for every model
Lumosel is an AI API gateway. One API key gives you access to Claude and other AI models through a single endpoint. Pay-as-you-go pricing, managed keys, usage windows, and a live billing dashboard. Free 14-day trial.
What is an AI API?
An AI API is an HTTP interface that lets your application send requests to AI models and receive responses. Instead of running models locally, you send text (prompts, conversation history, images) to an API endpoint and get generated text back — usually in JSON or server-sent events for streaming.
An AI API gateway like Lumosel sits between your application and the upstream model providers. It gives you one unified API, one key, and one billing dashboard — instead of managing separate accounts, keys, and billing for each model provider.
Why use an AI API gateway?
One key, every model
One API key gives you access to Claude and other models. No need to manage separate accounts for each provider.
Managed keys
Create, label, and revoke API keys from your dashboard. Limit spend per key.
Usage windows
Included usage windows reset automatically — the 4-hour window every 4 hours, the weekly window on the same day each week. Predictable spend, no surprises.
Live billing
Every API call is logged with tokens, latency, and cost. Your dashboard shows exactly what you spent and when.
Drop-in compatible
Lumosel speaks the Anthropic Messages API. Any SDK or tool that works with Anthropic works with Lumosel — just change the base URL.
OpenAI compatible
Also supports the OpenAI chat completions format. Migrate existing OpenAI-based applications to Claude models without rewriting your code.
Supported models
| Model | Provider | Tier | Input | Output |
|---|---|---|---|---|
claude-opus-4-8 | Anthropic | Most capable | $15 | $75 |
claude-opus-4-5 | Anthropic | Most capable | $15 | $75 |
claude-sonnet-4.5 | Anthropic | Balanced | $3 | $15 |
claude-haiku-4.5 | Anthropic | Fastest | $1 | $5 |
gpt-5.5 | OpenAI | Most capable | $10 | $30 |
Prices in USD per 1M tokens.
API formats
Anthropic Messages API
The primary API format. Use the official anthropic SDKs for Python and Node.js, Claude Code, Cursor, Cline, or any tool that reads the Anthropic environment variables. Endpoint: /v1/messages
OpenAI Chat Completions
OpenAI-compatible endpoint. Use any OpenAI SDK or tool that speaks the chat completions format. Route Claude and other models without changing your code. Endpoint: /v1/chat/completions
Start with a free 14-day trial
No credit card required. Get your API key in under a minute.