If you are searching for a European OpenRouter alternative that also supports audio transcriptions, cortects might be an alternative. Given the recent controversial developments at OpenAI, and as I was already on the search for European alternatives, I deleted my OpenAI account and switched to Cortects for the few places where I need an AI API. The UI and feature set still aren’t as polished as OpenRouter, but at least it has the audio transcription endpoint, which I use for a voice-to-text Telegram bot. For now, I mostly use the Mistral models.