Frontier AI. European control.

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  • OpenAI- and Anthropic-compatible
  • Processed in the EU, failover included
  • Never trained on your data

What Melious stands for

Leading AI models on European infrastructure, under European jurisdiction. Failover stays in Europe too.

Why Melious

The problem

Every option comes with a catch.

Choose a US or Chinese provider and you lose oversight of your data. Choose a European one and you often lose the frontier, or it runs on US hyperscalers anyway. Host it yourself and you take on the hardware, scaling and ops. And with most of them, you overpay.

The answer

Frontier AI. European control. No compromises.

60+ models, frontier LLMs included, on real European infrastructure, run by a German company and never trained on your data. Fast and affordable, with nothing to host yourself. Switching takes one line of code.

Keep your code. Change the URL.

The Melious API speaks both OpenAI's and Anthropic's format. One key and one base URL, whichever client you use.

Make your first call in five minutes(opens in a new tab) Set up Claude Code, Codex or Cursor
from openai import OpenAIclient = OpenAI(    api_key="sk-mel-<YOUR_API_KEY>",    base_url="https://api.melious.ai/v1",)response = client.chat.completions.create(    model="<MODEL_ID>",    messages=[{"role": "user", "content": "Hello from Europe"}],)print(response.choices[0].message.content)
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Run in Europe

Your requests are processed in European data centres, under European jurisdiction. If a location fails, traffic moves to another one in Europe, never outside it.

Read the Data Processing Agreement
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What our customers say

We put Melious through a thorough hands-on test. With GLM 5.2 we measured more than 350 tokens per second, and a development task that used to take 45 minutes was done in about 7. It stayed stable throughout, entirely on European infrastructure, and our data is not used for training. That convinced us to integrate Melious as a provider in ALBERT | AI, the AI in agorum core pro.

Oliver Schulze CEO & CTO of agorum

If inference stalls, the mule stumbles. Running agents smoothly only works when the inference keeps up. With Melious, we can be sure it does.

Bernd Paulus CTO & Co-Founder of mulios

Melious isn’t just a supplier for us, they’re responsive, reliable, and always thinking along with us.

Robert Keus CEO of GreenPT

FAQ

  • A European platform that gives you one API for the latest open-weight AI models and tools for your AI applications, all running on a network of European infrastructure providers. You get one endpoint, one bill, one set of values — sovereignty, privacy, transparency, sustainability — across the whole stack.

  • No. If you're using the OpenAI or Anthropic SDK, point the base URL at api.melious.ai, drop in your Melious API key, and you're done. Same interface, European infrastructure underneath.

  • No. Never. Your requests are end-to-end encrypted, stay on European infrastructure, and don't touch any training run — ours or anyone else's. We run inference, not a data collection scheme.

  • Your data stays under European jurisdiction. Our infrastructure partners are based across the EU or European Economic Area. No US legal exposure, no foreign government access, no fine print that quietly says otherwise.

  • You can use the latest open-weight models across many different categories such as text generation, image generation, audio transcription, embeddings or reranking. Browse the full list in the Hub and switch seamlessly between models by changing one string.

  • Requests are routed across multiple European providers with automatic failover. If one goes offline, your traffic moves to another for high availability without you having to do anything.

Ready to start?

Use it, build on it, make it yours.

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