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.
Qwen3.8 27B runs on the routes below. Route only to EU providers when your data has to stay in Europe. One route also sells flex 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 | $0.45 | $3.35 | Input price | Not offered on this route | ||
| EU | No | $0.84 | $3.35 | Input price | Not offered on this route | ||
| EU | No | $0.05 | $0.90 | $0.03 | Not offered on this route | ||
| EU | No | $0.45 | $2.68 | $0.11 | Not offered on this route | ||
| EU | No | $0.56 | $2.35 | Input price | Not offered on this route | ||
| EU | No | $0.67 | $3.69 | $0.13 | Not offered on this route | ||
| EU | No | $0.40 | $2.40 | $0.10 | Not offered on this route | ||
| US | No | $0.99 | $1.49 | Input price | Not offered on this route | ||
| US | No | $0.20 | $2.50 | $0.05 | |||
| US | No | $0.80 | $4.00 | $0.40 | Not offered on this route | ||
| US | No | $0.42 | $3.00 | $0.09 | Not offered on this route | ||
| Multi | No | $0.17 | $0.50 | $0.08 | Not offered on this route | ||
| Multi | No | $0.45 | $3.00 | Input price | Not offered on this route |
Qwen3.8 27B by Alibaba is a dense 27B open-weight vision-language model with image and video input, a 262K native context, thinking on by default, and Apache 2.0 weights.
Step-by-step setup for running LibreChat on each of these models through Opper.
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