Gemini 3.1 Pro Preview vs GPT-5.5for coding

```typescript
export async function withRetry<T>(fn: () => Promise<T>, maxAttempts: number): Promise<T> {
  for (let attempt = 1; ; attempt++) {
    try {
      return await fn();
    } catch (error: any) {
      const status = error?.status ?? error?.response?.status;
      const isFatal4xx = status >= 400 && status < 500 && status !== 429;
      
      if (isFatal4xx || attempt >= maxAttempts) throw error;
      
      const delay = (2 ** attempt) * 100 + Math.random() * 100; // Exponential + Jitter
      await new Promise(res => setTimeout(r…

```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…