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  5. Time to First Token
Inference & Deploymentaka TTFT

Time to First Token

The latency from sending a request to receiving the first output token.

Ask Melo about this← all terms

The latency from sending a request to receiving the first output token — dominated by prefill time and queuing delay.

Related terms

PrefillTokens Per SecondCold StartThroughput vs LatencyStreaming ResponseDFlash

Where Time to First Token comes up

  • NVIDIA Dynamo Shadow Engine: 7s LLM Failover vs 5-Min Cold Start
  • GigaToken: A Rust Tokenizer Claiming ~1000x Faster Than HuggingFace
  • Hugging Face Tokenizers v1 RC: Up to ~30× Faster, Same Token IDs
  • PhoneLLM: An Open Voice-Agent Model Claiming GPT-5.6 Terra Quality at 1/18th the Cost