/**
 * Normalizes `gen_ai.response.model` so it stays consistent with
 * `gen_ai.request.model` when they refer to the same logical model.
 *
 * Returns the request model when:
 * - Their canonical forms (lowercase, `.`→`-`) are equal, e.g.
 *   `claude-opus-4.6` vs `claude-opus-4-6`.
 * - The response is a less specific prefix of the request (server stripped a
 *   variant suffix like reasoning effort), e.g. request
 *   `claude-opus-4.7-high` vs response `claude-opus-4-7`.
 *
 * Returns the response model unchanged when it adds real specificity
 * (e.g. `gpt-5.4-mini` → `gpt-5.4-mini-2026-03-17`) or refers to a
 * genuinely different model.
 */
export declare function normalizeResponseModel(requestModel: string | undefined, responseModel: string | undefined): string | undefined;
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