Speech Arena Elo 1,206 on Artificial Analysis, latency not measured; ranked 46th (tied) of 112 in the TTS for Voice Agents 2026 index.
Benchmark summary: 9.3/100, ranked 46th (tied) of 112 in the TTS for Voice Agents 2026 index (Listed). Strongest criterion: voice quality, 8.9 of 20 points.
StepFun StepAudio 2.5 TTS (Aug 2026) is a proprietary text-to-speech (TTS) API from StepFun, measured by one independent benchmark, Artificial Analysis.
Overall score
9.3 /100
Data checked on September 30, 2026
Updated after each benchmark capture
Every point comes from a public benchmark: sources · methodology
StepFun StepAudio 2.5 TTS (Aug 2026) ranks 46th of 112 in the 2026 text-to-speech (TTS) API benchmark, with a score of 9.3/100.
Neither Coval nor Speko measures StepFun StepAudio 2.5 TTS (Aug 2026)'s latency, so it scores 0 of 60 on real-time speed and does not appear in the real-time ranking.
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.
In the Artificial Analysis Speech Arena (capture of October 1, 2026), StepFun StepAudio 2.5 TTS (Aug 2026) has an Elo of 1,206 (±16, 95% confidence) from 1,494 blind comparisons, 10th highest of the 92 models Artificial Analysis rates.
Artificial Analysis lists StepFun StepAudio 2.5 TTS (Aug 2026) at $85 per 1M characters (66th lowest of the 78 models Artificial Analysis lists a price for).
ElevenLabs Multilingual v2 is a proprietary text-to-speech (TTS) API from ElevenLabs, measured by two independent benchmarks: Artificial Analysis and Speko.
MiniMax Speech 2.8 Turbo is a proprietary text-to-speech (TTS) API from MiniMax, measured by two independent benchmarks: Artificial Analysis and Speko.
async Flash v1.5 is a proprietary text-to-speech (TTS) API from Async, measured by one independent benchmark, Artificial Analysis.