SpaceXAI Ships Grok Voice Transcribe 2.0 With 2x Accuracy at Same Price, Tops Artificial Analysis Chart

SpaceXAI released Grok Voice Transcribe 2.0 on Thursday, claiming roughly 2x accuracy over v1 at the same $0.10/hour batch and $0.20/hour streaming pricing. Word error rate on short phrases across 19 languages fell from 20.6% to 6.8%, and telephony English calls dropped from 3.9% to 2.7% WER on the first final transcript. The model ranks first among 32 streaming models on the public Artificial Analysis accuracy leaderboard. It is API-only via api.x.ai/v1/stt with speaker diarization, timestamps, and key-term biasing included; no open weights.