Opper is the AI gateway for agents.

One LLM router for 300+ frontier and open-weight models from Anthropic, OpenAI, Google, Mistral, Meta, xAI, and others, accessible through a single API with full OpenAI SDK compatibility.

The LLM Gateway is the routing layer: change one line of code to switch providers, add intelligent fallbacks for uptime, and pin to EU-resident infrastructure when residency matters. All without rewriting your application or running your own inference stack.

The AI Agent Control Plane sits above the gateway and gives teams full visibility and control over every AI call in production. Distributed tracing, online evaluation, scoring, prompt optimization, and per-call cost tracking. The same code that ships is the code you can debug, score, and improve over time.

Trusted by 50,000+ developers and companies serving more than 10 million end users, from regulated fintech to consumer AI products.

Get started at opper.ai

Docs: docs.opper.ai

Why work with us

• One integration, every frontier model. Drop-in OpenAI SDK compatibility means you change a base URL and your existing code runs. Switch models with a single string, set per-request fallbacks, and stay off any single provider's roadmap.
• EU-native by design. Hosted in AWS Stockholm and GDPR-compliant, with one EU sub-processor covering every model. Add models without amending your DPA or running an objection window. No prompts stored by default, and we never train on your data.
• Pay-as-you-go, no lock-in. Provider rates passed through at cost plus a flat 3% platform fee. No per-seat fees, no minimums, and only successful calls are billed.
• Control as you scale. Start with the gateway, then add the AI Control Plane for observability, routing, prompt steering, PII guardrails, and budget and compliance controls when you need them.