Lowest-Latency Inference APIs for Voice and Realtime Agents: A Time to First Token TTFT-First Benchmark
AITopTools Editorial TeamAugust 30, 2026
What changed
A new benchmark compares response speed for voice and real-time AI agents across language, speech-to-text, text-to-speech, and speech-to-speech systems. It focuses on “time to first token,” the delay before an AI begins responding, and labels results as independently measured, vendor-published, or vendor-measured.
What this means for you
Teams building voice agents can use the comparison as an initial guide when choosing an AI service, but speed alone does not capture the full user experience. The article reports figures checked against primary sources on August 30, 2026, without indicating that one provider is best overall.