async Flash v1.0
Listed Proprietary · Async
5.8
/100
async Flash v1.0 is a proprietary text-to-speech (TTS) API from Async, measured by one independent benchmark, Artificial Analysis.
Artificial Analysis
Hume AI Octave TTS Hume AI · text-to-speech (TTS) API
ListedSpeech Arena Elo 1,032 on Artificial Analysis, latency not measured; ranked 69th (tied) of 112 in the TTS for Voice Agents 2026 index.
Benchmark summary: 5.8/100, ranked 69th (tied) of 112 in the TTS for Voice Agents 2026 index (Listed). Strongest criterion: voice quality, 5.3 of 20 points.
Hume AI Octave TTS is a proprietary text-to-speech (TTS) API from Hume AI, measured by two independent benchmarks: Artificial Analysis and Speko.
Overall score
5.8 /100
Score breakdown
- Real-time speed 0 /60
- Voice quality 5.3 /20
- Accuracy 0 /15
- Price 0.5 /5
Data checked on September 30, 2026
Updated after each benchmark capture
Every point comes from a public benchmark: sources · methodology
Hume AI Octave TTS ranks 69th of 112 in the 2026 text-to-speech (TTS) API benchmark, with a score of 5.8/100.
Real-time latency
Neither Coval nor Speko measures Hume AI Octave TTS's latency, so it scores 0 of 60 on real-time speed and does not appear in the real-time ranking.
Accuracy (word error rate)
No accuracy measurement: Coval does not measure its word error rate and Speko does not rate its pronunciation robustness, so accuracy counts 0 of 15.
Voice quality
In the Artificial Analysis Speech Arena (capture of October 1, 2026), Hume AI Octave TTS has an Elo of 1,032 (±12, 95% confidence) from 4,619 blind comparisons, 66th highest of the 92 models Artificial Analysis rates. Speko rates its naturalness at 1,455 Elo from blind A/B votes (31st highest of the 41 models Speko rates).
Price
Artificial Analysis lists Hume AI Octave TTS at $87.5 per 1M characters (67th lowest of the 78 models Artificial Analysis lists a price for). Speko lists a cost of about $100 per 1M characters.
Benchmark measurements
Speko
- Naturalness (Elo)
- 1,455
- Price per 1M characters
- 100 USD
- Measured on
- 2026-09-08
- Speko model
- octave-1
- Speko model page
- benchmarks.speko.ai
Artificial Analysis Speech Arena
- Speech Arena Elo (blind listener preference)
- 1,032
- Elo 95% interval (±)
- 12
- Arena rank
- 66
- Arena rank range
- 62-72
- Arena appearances
- 4,619
- Voices tested
- 8
- Price per 1M characters
- 87.5 USD
- Released
- Feb 2025
- Artificial Analysis model
- Octave TTS
- Artificial Analysis leaderboard
- artificialanalysis.ai
Not collected
- Speed (Coval time to first audio) — not measured by Coval (capture of 2026-10-01, 30-day window); counts 0
- Speed (Speko time to first audio) — listed by Speko without this value (capture of 2026-10-01); counts 0
- Accuracy (Coval word error rate) — not measured by Coval (capture of 2026-10-01, 30-day window); counts 0
- Accuracy (Speko robustness) — listed by Speko without this value (capture of 2026-10-01); counts 0
Similar TTS models
Hume AI Octave 2
Listed Proprietary · Hume AI
5.8
/100
Hume AI Octave 2 is a proprietary text-to-speech (TTS) API from Hume AI, measured by two independent benchmarks: Artificial Analysis and Speko.
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+2
StepFun Step Audio EditX (Mar 2026)
Listed Open weights · StepFun
6
/100
StepFun Step Audio EditX (Mar 2026) is an open-weights text-to-speech (TTS) API from StepFun, measured by one independent benchmark, Artificial Analysis.
Artificial Analysis