GPT-Realtime-2.1
- Pricing
- Not published
- Released
- 5mo ago
Cost
Cartesia streaming text-to-speech model with sub-90ms latency, 42 languages and better handling of numbers, names and emails.
How it compares
Frequently asked questions
Quality and benchmarks
The closest alternatives are GPT-Realtime-2.1 by OpenAI, S2.1 Pro Free by Fish Audio, and Gemini 3.5 Transcribe Live by Google DeepMind. They were matched on model kind and release date, with no comparable price.
GPT-Realtime-2.1Sonic 3.5 vs GPT-Realtime-2.1S2.1 Pro FreeSonic 3.5 vs S2.1 Pro FreeGemini 3.5 Transcribe LiveSonic 3.5 vs Gemini 3.5 Transcribe Live
Licensing and access
No, Sonic 3.5 is not open source or open weights. Its openness is closed and its license is proprietary.
Basics
Sonic 3.5 was made by Cartesia and released on June 15, 2026.
Generated from Vertical Tabs data, updated November 11, 2026.
Discussion
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