Unverified50% confidenceFactExact time
首字节响应时间（TTFB）反映从请求发出到模型返回第一个token之间的延迟，涵盖网络传输、请求队列等待和模型预热时间
1
Sources
50%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
Codex额度不够用？HeyRoute接入GPT-5.5深度测评
bilibiliManCity-DeBruyne7/10/2026
Related Claims
UnverifiedIn TTS (Text-to-Speech) contexts, Time to First Byte (TTFB) refers to the time between when the API receives text input and when it returns the first playable audio data chunk.74% similarUnverifiedTTFT（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% similarUnverifiedTime-to-Value（TTV，价值抵达时间）指用户从首次打开产品到感受到核心价值的时间间隔，被现代PLG模式视为北极星指标之一61% similarUnverified用户口碑中存在对鉴定周期较长的反馈，实物邮寄+入库排队流程导致整体周期通常长于线下快鉴，时间紧迫的场景需提前预留时间57% similarUnverifiedUptime监控只能反映HTTP服务器是否返回200 OK，LangSmith/Langfuse追踪能反映延迟和token消耗，但没有工具能在答案语义质量缓慢下降时发出警报55% similar
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