/**
 * OpenRouter model catalog fetcher.
 *
 * GET https://openrouter.ai/api/v1/models returns the full catalog
 * (300+ entries) with per-token pricing in USD. We cache the result
 * for the duration of the process — the catalog only changes when
 * OpenRouter adds/removes models, which is rare enough that one
 * fetch per REPL session is the right trade-off.
 *
 * Pricing in the response is per-token; we convert to per-1M tokens
 * for display because that's how everyone quotes LLM costs.
 *
 * No auth required for /models (it's public). We hit it without the
 * user's API key so it works even before the user has finished
 * configuring their key.
 */
export interface OpenRouterModel {
    /** Canonical model ID, e.g. "anthropic/claude-sonnet-4". */
    id: string;
    /** Display name, e.g. "Claude Sonnet 4". */
    name: string;
    /** Context window in tokens, or null if unknown. */
    contextLength: number | null;
    /** USD per million input tokens. */
    promptPerM: number;
    /** USD per million output tokens. */
    completionPerM: number;
    /** True when the model is free (both prompt + completion = 0). */
    isFree: boolean;
}
/**
 * Fetch the OpenRouter model catalog, normalized + sorted (free
 * models first, then alphabetical by ID).
 *
 * Returns an empty array on any network / parse failure instead of
 * throwing — the caller is typically the model-picker, which can
 * gracefully say "couldn't fetch models" without aborting the REPL.
 */
export declare function fetchOpenRouterModels(): Promise<OpenRouterModel[]>;
/**
 * Format the per-million pricing as a compact column for use in
 * the picker's hint field. "in:$0.14 out:$0.28 · 128k" style.
 */
export declare function formatPricing(m: OpenRouterModel): string;