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OpenAI API vs Perplexity AI API

Same instrument, two spec sheets — measured, not claimed.

APIOpenAI APINEW—Perplexity AI APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OpenAI API vs Perplexity AI API: common questions

Which is more reliable, OpenAI API or Perplexity AI API?

On our scheduled checks, Perplexity AI API leads on measured uptime — OpenAI API at —% versus Perplexity AI API at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do OpenAI API and Perplexity AI API need an API key?

Both ask you to authenticate — OpenAI API uses an API key and Perplexity AI API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call OpenAI API and Perplexity AI API from the browser?

Yes — both OpenAI API and Perplexity AI API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are OpenAI API and Perplexity AI API free for commercial use?

OpenAI API has unclear commercial terms, and Perplexity AI API has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.