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.
Phi-4 runs on the routes below. Route only to EU providers when your data has to stay in Europe. Its 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 | |
|---|---|---|---|---|---|---|---|
| US | No | $0.07 | $0.14 | Input price |
Phi-4 by Microsoft: 14-billion parameter open-weight language model excelling at mathematical reasoning and complex problem-solving with 16K context window.
Step-by-step setup for running LibreChat on each of these models through Opper.
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The most popular self-hosted AI interface. Add Opper as a connection and every user gets 700+ models.
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