All tasks / Comparisons

Sonic 3.6 vs Gemini 3.8 Flash TTS

Compared only on public benchmark results, across the 1 task where both are listed: they share a tier in 1.

Sonic 3.6

Cartesia's low-latency streaming text-to-speech models, aimed at real-time voice agents.

Vendor: Cartesia
Weights: Closed: API and apps only
Released: 17 Aug 2026
API price: $49 per 1M characters (Artificial Analysis normalised price for Sonic 3.6 (USD per 1M characters).)
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Sonic 3.6

Gemini 3.8 Flash TTS

Google's Flash-tier Gemini text-to-speech model, served through the Gemini API.

Vendor: Google
Weights: Closed: API and apps only
Released: 23 Sep 2026
API price: $16 per 1M characters (Artificial Analysis normalised price for Gemini 3.8 Flash TTS (USD per 1M characters).)
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Gemini 3.8 Flash TTS

Task by task

Task	Sonic 3.6	Gemini 3.8 Flash TTS	Higher tier
Text to speech Models	A1,287 on Artificial Analysis Speech Arena: Text to Speech (provider voices) · Cloud	A1,278 on Artificial Analysis Speech Arena: Text to Speech (provider voices) · Cloud	Same tier

A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.

Same benchmark, both results

Benchmark	Sonic 3.6	Gemini 3.8 Flash TTS	Snapshot
Artificial Analysis Speech Arena: Text to Speech (provider voices) Elo from blind pairwise listener votes, each model using its own provider voices (all categories, US and UK accents), higher is better	1,287 Sonic 3.6	1,278 Gemini 3.8 Flash TTS	18 Oct 2026