Lowest-Latency Inference APIs for Voice and Realtime Agents: A Time to First Token TTFT-First Benchmark

MarkTechPost · 1 month ago · 35

Voice-agent latency benchmarks based on time-to-first-token (TTFT) and related measures are published across the full voice stack, including LLMs, speech-to-text, text-to-speech, and speech-to-speech. The practical voice-to-voice target is about 700ms of TTFT budget within a 700ms to 1.2s end-to-end turn. Providers and teams are encouraged to separate generation-start latency (TTFT) from first-sentence completion (TTFS) and treat vendor timing definitions, workload settings, and warm-start behavior as the deciding factors instead of a single TTFT figure.