The model field accepts these AIUS IDs, not provider model names:
IDDisplay name
union-alphaPareto
fable-5.1Claude Fable 5.1
opus-5.5Claude Opus 5.5
sonnet-5Claude Sonnet 5
gpt-6-astraGPT-6 Astra
gpt-6-solGPT-6 Sol
gpt-6-lunaGPT-6 Luna
An authenticated GET /v1/models returns the current catalog with context lengths and prices. POST /v1/chat/completions accepts OpenAI-style chat messages with one of these IDs. The server checks the account and, when an organisation is named, its membership and budget before it forwards a request.