Speech-to-Speech Index

In use

Artificial Analysis's combined score for speech-to-speech models.

xAI quotes the index in its Grok Voice 3 launch post.

Models scored in lab cards

Launch posts list it, from 1 lab

Grok Voice 3.0 leads with 86.9

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

Bars Table

Source: Labs’ model cards

#	Model	Score	Setting	Date	Source
1	Grok Voice 3.0	86.9		Oct 2026	Lab model card
2	Grok Voice 2.0	82.9		Jul 2026	Lab model card

All the scores we have, one dot each, so a model tested at several settings appears more than once.

Reported by the lab in its model card

Source: Labs’ model cards

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

xAI

Date	Launch post	Score	As the post writes it
Oct 14, 2026	Grok Voice 3.0	86.9	Speech-to-Speech Index, 86.9, per Artificial Analysis
Jul 29, 2026	Grok Voice 2.0	82.9	Overall AA Speech-to-Speech Quality Index, Grok Voice 2.0, per Artificial Analysis