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Opper is one API in front of every major AI model, hosted in the EU. Drop in your existing OpenAI, Anthropic, or Google AI SDK and keep your code — you get text, multimodal, and voice, plus observability, governance, and one sub-processor for every model.
Agent Assisted Development
Paste this into your coding agent — Claude Code, Cursor, Codex, and more — and it will set up and build with Opper for you.

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Start here

Quickstart

Five minutes to your first call.

What is Opper?

The product tour: Gateway, Rules, traces, and how they fit.

AI Gateway

One API, 300+ models, routing, and EU enforcement.

Security

Hosted in Stockholm. One sub-processor for every model. Store no logs at all if you need to.

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Build

Drop-in SDKs

Use the OpenAI, Anthropic, or Google AI SDK you already have.

Structured output

Constrain any response to a JSON Schema. Great for parsing and extraction.

Realtime

Two-way voice over WebSocket. OpenAI, xAI, and Gemini behind one protocol.

Models

The full catalog. EU-hosted models marked.

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Govern and improve

Observe & Control

Inspect calls and manage the rules Opper enforces.

Rules

Restrict providers, regions, retention, and budget at the gateway.

Checks

Score every response against criteria you write.

Concepts

Calls, spans, traces, scopes. The mental model that ties everything together.