Opper AI ✓

Opper AI is a European AI gateway that gives developers and AI agents access to 700+ models from 30+ providers, including Claude, GPT, Gemini, Grok and Mistral, through a single API and one balance. The API is drop-in compatible with the OpenAI, Anthropic and Gemini SDKs, so existing code and coding agents such as Claude Code, Cline or Kilo Code work by changing the base URL.

The gateway runs in the EU, and every route in the catalogue is labeled with its hosting region and data retention posture, including EU-hosted variants of frontier models for teams with GDPR or data residency requirements. Requests fail over automatically across providers, and only the successful model response is billed. Pricing is pay-as-you-go with no markup on provider token rates, no minimums and no lock-in.

Beyond routing, Opper includes a control plane for running AI in production: tracing and observability for every call, model fallbacks, guardrails and structured outputs on all models via JSON schemas. Open-source SDKs for Python and TypeScript and a CLI that can launch coding agents with inference routed through the gateway round out the platform.