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Models

AIUS v2 has a fixed catalog. The model field accepts these AIUS IDs, not arbitrary OpenRouter model names:
IDDisplay name
union-alphaPareto
gpt-6-astraGPT-6 Astra
gpt-6-solGPT-6 Sol
gpt-6-lunaGPT-6 Luna
sonnet-5Claude Sonnet 5
opus-5.5Claude Opus 5.5
fable-5.1Claude Fable 5.1
An authenticated GET /v1/models returns the current catalog and pricing metadata. POST /v1/chat/completions accepts OpenAI-style chat messages with one of the IDs above. The server enforces account authorization and model policy before forwarding a request. Web search used for research is separate from the fixed model list.