StepFunReleased Aug 26, 2026

StepAudio 2.5 TTS (Aug 2026)

Provider endpoints0

Benchmark results1

Measured performance

Benchmark results

All leaderboards ↗

AA Provider Voice TTS Arena ↗Unversioned · provider native voices

1,213.95

Provider native voices · all categories · US + UK accents · (Aug 2026) · 8 listed voices

95% CI 1,199.95–1,227.95 · n=1,999

Independent resultChecked Oct 17, 2026

Access & cost

Prices across providers

0 quotes

No listed provider price

Artificial Analysis Provider Voice Arena ↗

Model specifications

Developer: StepFun
Modality: Audio
Context: Not reported
Maximum output: Not reported
Weights: Closed weights
Released: Aug 26, 2026
First discovered: Oct 16, 2026

Exact identities

aa-ttsb8ae91a5-c9c0-4972-9b31-293bce09c984

Sources

Artificial Analysis Provider Voice Arena ↗

Updated Oct 17, 2026

More from StepFun

StepFunReleased Feb 12

Step Audio EditX (Mar 2026)

Open weights

AA Native VoiceProvider native voices · all categories · US + UK accents · (Mar 2026) · 2 listed voices1,096.86

Price not listed

StepFunReleased Feb 12

Step TTS 2 (Mar 2026)

AA Native VoiceProvider native voices · all categories · US + UK accents · (Mar 2026) · 2 listed voices1,136.82

Price not listed