export interface AnthropicVisionInput {
    width: number;
    height: number;
    /** Anthropic's estimator does not branch on detail; accepted for API parity. */
    detail?: 'low' | 'high' | 'auto';
}
/**
 * Anthropic vision token estimator.
 *
 * Approximation per Anthropic guidance: tokens ≈ ceil((width * height) / 750),
 * capped at 1600 tokens per image.
 */
export declare const visionTokens: ({ width, height }: AnthropicVisionInput) => number;
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