GPT-5.5 vs GPT-5.6 Lunafor coding

```ts
type RetryOptions = { attempts?: number; baseMs?: number; maxMs?: number };

const sleep = (ms: number) => new Promise(r => setTimeout(r, ms));

const statusOf = (x: any): number | undefined =>
  typeof x?.status === "number" ? x.status :
  typeof x?.response?.status === "number" ? x.response.status :
  undefined;

const isNonRetryable4xx = (s?: number) =>
  s !== 429 && s !== undefined && s >= 400 && s < 500;

export async function retry<T>(
  fn: () => Promise<T>,
  { attempts = 5, baseMs = 200, maxMs = 5000 }: RetryOptions = {}
): Prom…

```ts
export async function retry<T>(
  operation: () => Promise<T>,
  maxAttempts = 5,
  baseDelayMs = 200
): Promise<T> {
  if (maxAttempts < 1) throw new RangeError("maxAttempts must be >= 1");

  for (let attempt = 1; ; attempt++) {
    try {
      return await operation();
    } catch (error) {
      const e = error as { status?: number; response?: { status?: number } };
      const status = e.status ?? e.response?.status;
      const nonRetryable4xx =
        status !== undefined && status >= 400 && status < 500 && status !== 429;…