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Opper is an EU hosted gateway. One key reaches models from OpenAI, Anthropic, Google, Mistral, DeepSeek, Moonshot and open weight vendors at https://api.opper.ai/v3/compat. Mirrors the Requesty provider added in HKUDS#159: a ProviderSpec on the generic openai_compat gateway path, the matching ProviderConfig block, and tests pinning the wiring. Two provider specific decisions, both covered by tests. Prompt caching is on, because Opper serves Anthropic models and prices cached input separately, and bare pool names start with claude so the existing trigger applies. strip_model_prefix stays off, unlike Forge: Opper ids are bare pool names, but a provider/model id such as azure/gpt-5.5 deliberately pins one route, so stripping the prefix would silently change routing.
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Opper is an EU hosted gateway. One key reaches models from OpenAI, Anthropic, Google, Mistral, DeepSeek, Moonshot and open weight vendors at https://api.opper.ai/v3/compat.
Mirrors the Requesty provider added in #159: a ProviderSpec on the generic openai_compat gateway path, the matching ProviderConfig block, and tests pinning the wiring.
Two provider specific decisions, both covered by tests. Prompt caching is on, because Opper serves Anthropic models and prices cached input separately, and bare pool names start with claude so the existing trigger applies. strip_model_prefix stays off, unlike Forge: Opper ids are bare pool names, but a provider/model id such as azure/gpt-5.5 deliberately pins one route, so stripping the prefix would silently change routing.
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Disclosure: I work at Opper. Opper is an OpenAI-compatible gateway hosted in the EU, and a good part of what it adds over a generic endpoint is European native routes, so requests can be pinned to EU-hosted regions. Happy to adjust anything here to match project conventions, or to close it if a named provider is not wanted.