Usage Limits

Free LLM API Usage Limits: Quotas, Caps & Reset Times Compared

When evaluating free tier APIs for software integration, knowing the exact quotas and throttling rules protects your application from unexpected outages. This comprehensive reference catalogs the exact limits, reset schedules, and concurrency rules for all major free AI platforms in 2026.

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1. Granular Provider Quota Audit

ProviderRPM LimitDaily Request CapDaily Token CapMax ContextReset Schedule
**Google AI Studio**15 RPM1,500 RPD~1.5B tokens/mo1,048,57600:00 UTC
**Groq Cloud (Llama 70B)**30 RPM14,400 RPD500,000 TPM128,000Rolling 24h
**Groq Cloud (Llama 8B)**30 RPM14,400 RPD1,000,000 TPM128,000Rolling 24h
**OpenRouter Free**20 RPM200 RPDModel specific131,07200:00 UTC
**GitHub Models**15 RPM150 RPD150k TPM128k–200kRolling 24h
**Mistral Experiment**60 RPMFair Use (~5k)500k TPM128,000Rolling 60m

2. How to Monitor and Stay Within Free Quotas

Most providers return remaining budget information directly in standard HTTP response headers:

  • Groq: Returns x-ratelimit-remaining-requests-day and x-ratelimit-remaining-tokens-minute.
  • Google: Provides real-time usage analytics directly in the Google AI Studio console dashboard.
  • GitHub: Returns x-ratelimit-remaining on every API call.

By parsing these headers after every response, your backend service can preemptively throttle traffic before an HTTP 429 occurs.

Frequently Asked Questions

Can I increase my free rate limits without paying?

Google AI Studio allows requesting quota increases through Google Cloud project tier associations while still maintaining pay-as-you-go free threshold discounts.

What happens when my daily quota is reached?

The API returns HTTP 429 until the reset schedule triggers (usually midnight UTC). Normal operations resume automatically with zero penalty.