Five Free LLM APIs Tested With One Python Script: Speed, Limits, and Reliability
A developer evaluated five free LLM APIs — Groq, Google AI Studio, OpenRouter, Cloudflare Workers AI, and Token Harbor — using a single Python script without adding a credit card to any account. Two tasks were used: a short Python debugging challenge and a large-context retrieval test using a synthetic incident log of roughly 20,000 words. Groq proved fastest for short requests but was constrained by an 8,000 tokens-per-minute cap, while Google AI Studio handled a large 84,424-token input successfully after one 503 error. OpenRouter and Cloudflare Workers AI showed occasional rate-limit rejections and harder setup, respectively, while Token Harbor processed tasks quickly but displayed usage as a percentage rather than exact token counts. The results, captured on August 28–29, 2026, represent a point-in-time snapshot, as free-tier limits across all providers are subject to frequent change.
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