Deepgram
flux
Measured 2026-07-03
Run flux on Speko →One API, every model on this board.
Naturalness
1550
Win % · 95% CI
—
Drift
25
variance analyzer, 20 repeats, run 2026-09-02T10-00-22-058Z, measured 2026-09-02. Single draw; not comparable with other rows in this column.
Synth p50
106ms
106–148 p50–p90
Mean of two 2026-08-12 sweeps (104/108 p50), n=30 each, concurrency 1, one keep-alive connection, 0 rejected. Anchors in the same sweeps came in 11–26% off their published cells, so the column needs a full re-baseline before these are read against each other.
Robustness
0.20
Fined:
• fatal · currency — dropped the minus sign (34 of 35 transcripts)
→ we sent “Your account shows −$85.40 after the refund.”
→ it said “Your account shows SMITE 5.4 after the refund.”
• fatal · dates — never said “monday” (19 of 35 transcripts)
→ we sent “Payments resume Mon, Feb 2.”
→ it said “Pason's resume mon. February 2nd.”
• fatal · large numbers — never said “zero zero” (5 of 5 transcripts)
→ we sent “Only 007 seats remain.”
→ it said “Only seven seats remain.”
+ 25 more fined
Cost / 1M chars
$45.0
Deepgram published list, Pay As You Go: $0.0450 per 1,000 characters = $45/1M. Same unit that puts Aura-2 at $0.030/1k = the $30 cell above, so the two are directly comparable — Flux TTS costs 50% more than Aura-2. Growth tier is $0.0405/1k ($40.5/1M). Free to build against through 2026-09-12 (45 concurrent streams globally, 5 EU/AU); billing starts 09-13.
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