A new analysis of AI API performance highlights the critical distinction between Time to First Byte (TTFB) and Time to First Token (TTFT). TTFB measures network latency to the API endpoint, while TTFT measures the actual time until the first word of a response appears, including model processing and queuing. The study found that TTFT is a more relevant metric for user experience, as it is heavily influenced by the underlying AI model and provider queuing, not just network speed. Performance also varies significantly by region, with identical APIs showing an 18.9x difference based on geographic location. AI
IMPACT Clarifies key performance metrics for AI APIs, guiding developers and users toward more accurate speed comparisons.
RANK_REASON Analysis of AI API performance metrics and their implications for benchmarking.
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