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AI / Google Antigravity Gemini Fundamentals Interview Questions

What are the Gemini API rate limits and how do they differ between free and paid tiers?

The Gemini API enforces rate limits on three dimensions: requests per minute (RPM), requests per day (RPD), and tokens per minute (TPM). Limits vary significantly by model and whether you are on the free tier or a paid billing tier.

Key rate limits (mid-2026)
ModelFree tier RPMFree tier RPDPaid tier RPM
Gemini 3.5 FlashVaries (check AI Studio)VariesHigher (billing required)
Gemini 3.1 Pro PreviewNo free tierNo free tierBilling required
Gemini 2.5 Flash10 RPM250 RPDMuch higher
Gemini 2.5 Flash-Lite15 RPM1,000 RPDMuch higher
Gemini 2.5 Pro5 RPM100 RPDBilling required for higher
import time
from google import genai
from google.api_core import exceptions

client = genai.Client()

# Handle rate limiting with exponential backoff:
def generate_with_retry(prompt, model="gemini-2.5-flash", max_retries=3):
    for attempt in range(max_retries):
        try:
            response = client.models.generate_content(
                model=model, contents=prompt
            )
            return response.text
        except exceptions.ResourceExhausted:  # 429 rate limit error
            wait = 2 ** attempt
            print(f"Rate limited. Waiting {wait}s (attempt {attempt+1})")
            time.sleep(wait)
    raise Exception("Max retries exceeded")

# Tips for free tier:
# - Add delays between calls (1-2 seconds minimum)
# - Use Flash-Lite (higher RPD: 1,000/day)
# - Monitor quota in AI Studio dashboard
# - Enable billing for Tier 1 ($250/month cap available)

Key changes: Google reduced free tier limits by 50-80% in December 2025. Tutorials and documentation written before that date will show stale (higher) numbers. Always check current limits in the AI Studio quota dashboard.

What HTTP status code does the Gemini API return when a rate limit is exceeded?
Which Gemini model has the highest free-tier RPD (requests per day) allowance?

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