LibreChat is the leading open-source AI chat platform, a self-hosted ChatGPT alternative with multi-model chat, agents, file handling, and search. Custom endpoints are a headline feature: one block in librechat.yaml adds any OpenAI-compatible provider. Point it at Opper and your whole workspace chats across 700+ models on one key, with a choice of EU or US inference behind it.
LibreChatoninPaste this into your coding agent (Claude Code, Cursor, Codex, and more) and it will set up and build with Opper for you.
Qwen3.5 9B runs on the routes below. Route only to EU providers when your data has to stay in Europe. One route also sells flex and priority processing: the same model at another price, picked per request with service_tier. How service tiers work.
| Provider | Region | Zero data retention | Training | Input | Output | Cache read | ||
|---|---|---|---|---|---|---|---|---|
| EU | No | $0.04 | $0.07 | $0.02 | Not offered on this route | Not offered on this route | ||
| EU | No | $0.08 | $0.39 | Input price | Not offered on this route | Not offered on this route | ||
| US | No | $0.10 | $0.15 | Input price | ||||
| Multi | No | $0.09 | $0.13 | $0.04 | Not offered on this route | Not offered on this route |
Qwen3.5 9B by Alibaba: 9B multimodal model with vision, tool calling, and reasoning for balanced performance and efficiency.
Step-by-step setup for running LibreChat on each of these models through Opper.
A secure AI workspace for companies: 25+ leading models, projects and connectors in one GDPR-compliant platform, hosted in Europe.
built on Opper
The most popular self-hosted AI interface. Add Opper as a connection and every user gets 700+ models.
OpenAI-compatibleAsk a question and let a panel of leading AI models vote, debate, and reach consensus, side by side in one place.
by Opper