GPT-5.3-Codex vs GPT-5.5for coding

```ts
type RetryOptions = {
  maxAttempts: number;
  baseDelayMs?: number;
  maxDelayMs?: number;
  jitterRatio?: number; // 0.2 => ±20%
};

export async function retryWithBackoff<T>(
  op: () => Promise<T>,
  { maxAttempts, baseDelayMs = 200, maxDelayMs = 10_000, jitterRatio = 0.2 }: RetryOptions
): Promise<T> {
  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
    try {
      return await op();
    } catch (err: any) {
      const status = err?.status ?? err?.response?.status;
      const nonRetriable4xx = status >= 400 && status <…

```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…