/**
 * OpenRouter slug stability rules.
 *
 * Profiles store vendor-native ids (e.g. `gemini-2.5-flash-lite`). Routed calls must use
 * stable OpenRouter `id` values (e.g. `google/gemini-2.5-flash-lite`), not retired dated
 * preview slugs (e.g. `google/gemini-2.5-flash-lite-preview-06-17`).
 */
export declare function isDatedPreviewSlug(value: string): boolean;
/** True when modelId embeds a vendor OpenRouter slug (`google/gemini-…`) instead of a native id. */
export declare function isEmbeddedOpenRouterSlug(provider: string, modelId: string): boolean;
export declare function assertStableOpenRouterSlug(slug: string): void;
export declare function stableSlugWarning(slug: string): string | null;
/**
 * When syncing from the OpenRouter API, drop preview variants that have a stable sibling id.
 * Example: omit `google/gemini-2.5-flash-lite-preview-09-2025` when `google/gemini-2.5-flash-lite` exists.
 */
export declare function filterSupersededOpenRouterPreviewModels<T extends {
    id: string;
}>(models: T[]): T[];
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