{
 "publisher": "SpeechifyAI",
 "provenance": "SpeechifyAI's own measurement of its own API on 9 Oct 2026, for /blog/websocket-tts-streaming-for-voice-agents. A Google Cloud VM in us-east4 (northern Virginia) ran tts-probe input-stream from tools/tts-probe in the SpeechifyAI API repository through tools/tts-probe/scripts/run-from-gce.sh. Every session is kept below, the two warm-up rounds included and marked; the summary and the post's figures are computed from the sessions with warmup false and no error. It is a measurement on one day from one place, not a guarantee.",
 "capturedOn": "2026-10-09",
 "date": "9 Oct 2026",
 "tool": "tts-probe input-stream",
 "startedAt": "2026-10-09T10:14:37+00:00",
 "finishedAt": "2026-10-09T10:24:48+00:00",
 "vantage": {
  "gcpRegion": "us-east4",
  "label": "Ashburn",
  "source": "GCE metadata (us-east4)",
  "python": "3.12.3",
  "httpx": "0.28.1",
  "websockets": "15.0.1"
 },
 "config": {
  "baseUrl": "https://api.speechify.ai",
  "model": "simba-3.2",
  "voice": "geffen_32",
  "outputFormat": "pcm_24000",
  "tokenIntervalMs": 40.0,
  "sessionsPerArm": 50,
  "warmupRoundsDiscarded": 2,
  "pauseBetweenSessionsS": 1.0
 },
 "method": {
  "clockStarts": "when the first token exists; token k exists at k times the token interval",
  "firstAudible": "a 1x player that starts on the first audio byte and plays the segments in order reaches the first 10 ms window whose RMS is at least 1% of full scale (Coval's onset rule); a chunk is playable once it and every chunk before it has arrived",
  "lastAudio": "the last audio byte arrives",
  "playbackEnd": "the same player plays the last sample, stalls included",
  "sentenceBoundary": "., !, ? or the ellipsis followed by whitespace, the server's rule, applied by the client in the sentences arm",
  "wsOpen": "the WebSocket opens before the first token and its open time is reported apart, because an agent opens it while its LLM is still thinking",
  "httpConnection": "one HTTP/2 connection kept alive for the whole run, so no measured request pays a handshake; the sentences arm multiplexes concurrent sentences on it",
  "percentiles": "linear interpolation between closest ranks",
  "arms": {
   "ws": "GET /v1/audio/stream/ws, every token sent the moment it exists, then input.close",
   "sentences": "POST /v1/audio/stream per sentence, sent the moment the sentence is complete, responses played in order",
   "whole": "POST /v1/audio/stream once with the whole reply, after its last token"
  }
 },
 "exampleReply": "Sure, I can help with order 4000. It left our Denver warehouse at 6:00 this morning and should arrive on Thursday. I've emailed you a tracking link ending in 1000, so you can follow it on the way. Is there anything else I can help you with on order 4000 today?",
 "exampleTokens": [
  "Sure",
  ",",
  " I",
  " can",
  " help",
  " with",
  " order",
  " 400",
  "0",
  ".",
  " It",
  " left",
  " our",
  " Denver",
  " warehouse",
  " at",
  " 6",
  ":",
  "00",
  " this",
  " morning",
  " and",
  " should",
  " arrive",
  " on",
  " Thursday",
  ".",
  " I've",
  " emailed",
  " you",
  " a",
  " tracking",
  " link",
  " ending",
  " in",
  " 100",
  "0",
  ",",
  " so",
  " you",
  " can",
  " follow",
  " it",
  " on",
  " the",
  " way",
  ".",
  " Is",
  " there",
  " anything",
  " else",
  " I",
  " can",
  " help",
  " you",
  " with",
  " on",
  " order",
  " 400",
  "0",
  " today",
  "?"
 ],
 "summary": {
  "ws": {
   "sessions": 50,
   "errors": 0,
   "first_audible_ms": {
    "p50": 448.6,
    "p90": 467.4,
    "mean": 452.3
   },
   "last_audio_ms": {
    "p50": 2656.4,
    "p90": 2717.0,
    "mean": 2664.3
   },
   "playback_end_ms": {
    "p50": 17958.3,
    "p90": 18508.9,
    "mean": 17906.2
   },
   "first_byte_ms": {
    "p50": 438.6,
    "p90": 457.4,
    "mean": 442.3
   },
   "leading_silence_ms": {
    "p50": 10.0,
    "p90": 10.0,
    "mean": 10.0
   },
   "stall_ms": {
    "p50": 0.0,
    "p90": 0.0,
    "mean": 0.0
   },
   "open_ms": {
    "p50": 64.8,
    "p90": 86.1,
    "mean": 67.9
   }
  },
  "sentences": {
   "sessions": 50,
   "errors": 0,
   "first_audible_ms": {
    "p50": 468.4,
    "p90": 479.1,
    "mean": 469.9
   },
   "last_audio_ms": {
    "p50": 2670.5,
    "p90": 2728.9,
    "mean": 2681.0
   },
   "playback_end_ms": {
    "p50": 17904.3,
    "p90": 18606.8,
    "mean": 17935.1
   },
   "first_byte_ms": {
    "p50": 458.4,
    "p90": 469.1,
    "mean": 459.9
   },
   "leading_silence_ms": {
    "p50": 10.0,
    "p90": 10.0,
    "mean": 10.0
   },
   "stall_ms": {
    "p50": 0.0,
    "p90": 0.0,
    "mean": 0.0
   }
  },
  "whole": {
   "sessions": 50,
   "errors": 0,
   "first_audible_ms": {
    "p50": 2524.6,
    "p90": 2537.3,
    "mean": 2524.6
   },
   "last_audio_ms": {
    "p50": 3195.8,
    "p90": 3312.8,
    "mean": 3211.1
   },
   "playback_end_ms": {
    "p50": 20865.2,
    "p90": 21933.1,
    "mean": 20972.7
   },
   "first_byte_ms": {
    "p50": 2514.6,
    "p90": 2527.3,
    "mean": 2514.6
   },
   "leading_silence_ms": {
    "p50": 10.0,
    "p90": 10.0,
    "mean": 10.0
   },
   "stall_ms": {
    "p50": 0.0,
    "p90": 0.0,
    "mean": 0.0
   }
  }
 },
 "sessions": [
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   "arm": "ws",
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   "playback_end_ms": 16864.7,
   "audio_ms": 16404.0,
   "stalls": 0,
   "stall_ms": 0.0,
   "billable_chars": 257,
   "requests": [
    {
     "sent_ms": 0.0,
     "chars": 260,
     "status": 101,
     "first_byte_ms": 460.7,
     "end_ms": 2650.2,
     "request_id": "0ccb9537045370cd30247ebf",
     "server_timing": null
    }
   ],
   "error": null
  },
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    }
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   "error": null
  },
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