$0.08 per minute.
There is no free API; it costs $0.08 per minute.
#4 of 17 in Realtime. Strongest at: Speech & Voice.
On τ-Voice · AA · retail, Grok Voice 2.0 scores 49.7 vs 50 — about the same.
No, Grok Voice 2.0 is a closed model available through an API.
Grok Voice 2.0 is a closed speech & voice model from xAI.
GPT Live 1 (cheaper).