export type ReasoningEffortLevel = 'low' | 'medium' | 'high' | 'xhigh';
/** The only model we expose. Hardcoded — do not add variants without intent. */
export declare const ALLOWED_MODEL = "gpt-5.4";
/**
 * The full set of accepted `reasoning` values. Order matters for display:
 * medium/high first (the common cases), xhigh next (exceptional research),
 * low last (rare, kept for completeness).
 */
export declare const REASONING_OPTIONS: readonly ["gpt-5.4(medium)", "gpt-5.4(high)", "gpt-5.4(xhigh)", "gpt-5.4(low)"];
export type ReasoningOption = (typeof REASONING_OPTIONS)[number];
export interface ParsedReasoning {
    model: string;
    effort: ReasoningEffortLevel;
}
export declare function isReasoningOption(value: unknown): value is ReasoningOption;
/**
 * Parse a `reasoning` value such as `gpt-5.4(high)` into its model id and
 * reasoning-effort level. Throws on any value not in {@link REASONING_OPTIONS}.
 */
export declare function parseReasoning(value: string): ParsedReasoning;