Model Catalog
The Model Catalog is the single source of truth for every Theo engine — capabilities, credit cost, context window, fallback chain, sort order, and feature flags.
In depth
Adding a new engine is a one-file change: append a ModelEntry to the catalog, register a provider adapter if needed, and ship behind a feature flag. Every dependent surface — credit accounting, context limits, consensus membership, image router, help docs — reads from the catalog automatically.
User-visible naming follows a hard branding rule: only `Theo`-prefixed display names ever leave the server.
Also known as
Want to put this concept to work in OpenCharts?
Browse enginesRelated terms
Theo (Chat Engine)
Theo is the default conversational engine — fast, capable, and tuned for everyday chat, drafting, and lightweight tool calling.
Theo Pro
Theo Pro is the higher-quality conversational engine — used for hard reasoning, code, and modes where correctness and depth matter more than latency.
AI Credits
AI Credits are the unit OpenCharts uses to meter Theo usage — every chat reply, image, video, or autonomous skill run consumes a credit amount based on the engine and tools involved.