Model comparison
Compare Eleven v3 Conversational and Grok Voice Think Fast 2.0 using the same provider-sourced voice & realtime rubric. No mystery score and no invented benchmark ranking.
Facts checked September 4, 2026
Quick take
ElevenLabs' expressive realtime text-to-speech model for natural dialogue, emotional delivery, audio tags, and more than 70 languages.
It is not a complete speech-to-speech agent by itself. End-to-end latency also includes transcription, LLM response time, transport, and playback.
SpaceXAI's current realtime speech-to-speech model for sub-second conversational agents with tool access.
The model-specific price is higher than the generic 'starting at' Voice API headline. Use the Think Fast 2.0 row when budgeting.
Compare the published facts
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Voice & realtime | Eleven v3 Conversational | Grok Voice Think Fast 2.0 |
|---|---|---|
| Price basisToken-, character-, or minute-based price for the listed access route. | $0.05 / 1K characters | $0.08 / audio minute |
| Interaction modeSpeech-to-speech, audio-to-audio, or streamed text-to-speech behavior. | Realtime text-to-speech / text-to-dialogue | Realtime speech-to-speech with tools |
| Published latencyProvider-published measurement with its stated exclusions; not a Cody test. | ~280ms, excluding app/network | Sub-second provider claim |
| LanguagesProvider-documented language coverage or a clear unpublished marker. | 70+ languages | Exact supported list not published here |
| Tools & controlNative function calling, reasoning, or speech-control features. | Audio tags; orchestration handled by your agent stack | Realtime tool use |
| Context or input limitDocumented token or character limit where it is meaningful. | 5K-character guidance for v3 family; verify endpoint | Not published |
How to choose
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
ElevenLabs says enterprise customer data is not used for training by default. Other users can opt out of model improvement; enterprise zero-retention and regional environments are available with plan-specific limits.
Provider and API links
SpaceXAI says it does not train on API inputs or outputs without explicit permission. Default encrypted retention is 30 days; team-level zero data retention is available with feature tradeoffs.
Provider and API links
Frequently asked questions
Eleven v3 Conversational: ElevenLabs' expressive realtime text-to-speech model for natural dialogue, emotional delivery, audio tags, and more than 70 languages. Grok Voice Think Fast 2.0: SpaceXAI's current realtime speech-to-speech model for sub-second conversational agents with tool access.
Consider Eleven v3 Conversational when your priority is Expressive support and assistant voices. Consider Grok Voice Think Fast 2.0 when your priority is Realtime voice agents with tools. Test both with your own data and provider route before committing.
No. This comparison aligns provider-published facts for the Voice & realtime category. It does not claim a universal winner or combine incompatible third-party benchmark scores.
