Unverified50% confidenceFactExact time
TTFT determines how long a user waits from sending a request to seeing the first token, while ITL determines the pace at which subsequent content is generated.
1
Sources
50%
Confidence
Long-term
Relevance
9/15/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedTime to First Token (TTFT) refers to the time interval between a user submitting a request and the model outputting the first token, and is primarily constrained by the time cost of the prefill phase in which the model processes the input prompt.78% similarUnverifiedTTFT is determined by the Prefill phase and is compute-bound, while TPOT corresponds to the Decode phase and is memory-bandwidth-bound.69% similarUnverified流式STT和TTS允许系统在处理未完成时就开始并行处理，从而压缩用户感知到的等待时间64% similarUnverified在流式输出模式下，系统可在收到第一个Token时立即启动TTS合成，无需等待完整回复生成62% similar
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