Unverified60% confidenceFactExact time
Time to First Byte (TTFB) reflects the latency from when a request is sent to when the model returns the first token, encompassing network transmission, request queue waiting time, and model warm-up time.
2
Sources
60%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
Running Out of Codex Quota? An In-Depth Review of HeyRoute's GPT-5.5 Integration
bilibiliManCity-DeBruyne7/10/2026
Related Claims
VerifiedTTFT（首个token生成时间）是衡量LLM用户体验的核心指标，决定用户从提交请求到看到第一个字符的等待时长73% similarUnverifiedLLM inference latency is typically broken down into Time To First Token (TTFT) and Time Per Output Token (TPOT).66% similarUnverifiedTTFT (time-to-first-token) is a core metric for measuring the experience of interactive applications.65% similarUnverifiedIn high-concurrency RAG serving scenarios, storage latency and throughput directly determine overall response time.64% similarUnverifiedUsing only completion time as an optimization metric obscures time-to-first-byte (TTFB/TTFT), which is critical to real user experience.62% similar
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