What's the difference between Opper and OpenRouter?
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Both are unified APIs across hundreds of models with drop-in OpenAI SDK compatibility, no markup on provider prices and no prompts stored by default. Opper's API endpoint runs in the EU by default and EU routes work on every plan, while OpenRouter's EU endpoint needs its Business plan at an 8% fee. Opper builds in span-level tracing and checks that read both the prompt and the answer, where OpenRouter sends traces to external tools through Broadcast. Opper charges 3% on credit top-ups (5.5% with Control Plane, which adds tracing, rules and checks) against OpenRouter's 5.5%.
Is Opper a drop-in replacement for OpenRouter?
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Yes. Opper exposes an OpenAI-compatible endpoint, so any OpenRouter setup using the OpenAI SDK can swap base_url and API key without rewriting prompts, tool calls, or routing logic. The catalog covers 700+ models, including Claude, GPT, Gemini, DeepSeek, Mistral and Qwen, through a single key.
How is Opper's pricing different from OpenRouter's 5.5% fee?
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OpenRouter charges 5.5% on card top-ups ($0.80 minimum), 5% on crypto and 8% on its Business plan. Opper charges 3% on top-ups (5.5% with Control Plane, which adds tracing, rules and checks), about 45% lower on the base plan, with no subscription, no minimums and the same pass-through provider rates.
Does Opper offer EU data residency? OpenRouter requires a Business or Enterprise plan for EU routing.
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Yes, on every plan. Opper's API endpoint runs in Stockholm by default, with nothing to opt into, and calling an EU route keeps inference in Europe too. OpenRouter routes requests through eu.openrouter.ai only on its Business and Enterprise plans, Business raises its platform fee from 5.5% to 8%, and 70 of its 466 models were served in-region in October 2026. Opper runs Claude, GPT, Gemini and Mistral models on AWS Bedrock, Azure, Google Cloud and Berget AI in the EU. Every EU route is listed at opper.ai/models/eu with its provider, country, data retention and price, and Opper is certified against ISO/IEC 27001:2022 (trust.opper.ai).
Does OpenRouter have zero data retention?
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Yes, as a routing option. OpenRouter logs no prompts by default and can send a request, or a whole account, only to providers with zero data retention, while each provider keeps its own policy. Opper is the same at the gateway, and every route in its model directory shows its data retention, with zero data retention on most routes, on every plan, including routes in the EU.
What are some good European alternatives to OpenRouter?
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Opper runs its API in Stockholm with EU routes on every plan. Cortecs (Austria) keeps every request in the EEA, Eden AI (France) and Requesty (UK) offer separate EU endpoints, and OpenRouter itself has an EU endpoint on its Business and Enterprise plans. Our ranking of
the best European AI gateways compares them route by route.
Is LiteLLM similar to OpenRouter?
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Both give you one OpenAI-compatible API across many providers. OpenRouter is a hosted service with one account and credits, while LiteLLM is MIT-licensed software you host yourself, with your own provider keys. Opper is hosted like OpenRouter, with its API in the EU.
OpenRouter vs LiteLLM goes deeper.
What is the cheapest alternative to OpenRouter?
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On fees alone, LiteLLM is free to self-host, paid for in engineering time, and Vercel AI Gateway charges no platform fee but meters team-wide controls. Among hosted gateways that bill every model through one account, Opper's 3% fee on credit purchases is below OpenRouter's 5.5%, and Opper's free models work without a credit card.
Is OpenRouter being acquired by Stripe?
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Yes. On August 19, 2026, Stripe announced it has agreed to acquire OpenRouter, and OpenRouter says its mission, name, product and roadmap stay the same. A change of owner is a good moment to keep a tested second gateway.
Can I migrate from OpenRouter to Opper without rewriting my code?
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Most teams move in under an hour. Change two lines, base_url and api_key, and your existing OpenAI SDK calls route through Opper instead. Model ids stay provider-prefixed, so anthropic/claude-sonnet-4.6 on OpenRouter is anthropic/claude-sonnet-4-6 on Opper. Add fallbacks, EU routes or checks when you're ready; nothing else has to change up front.
