# Grok Voice Think Fast 2.0 vs Ultravox v0.4.1 Llama 3.1 8B

> Side-by-side benchmark comparison for Grok Voice Think Fast 2.0 and Ultravox v0.4.1 Llama 3.1 8B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/grok-voice-think-fast-2-0-vs-ultravox-v0-4-1-llama-3-1-8b
- Last updated: September 18, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Grok Voice Think Fast 2.0 and Ultravox v0.4.1 Llama 3.1 8B.

## Summary

- Grok Voice Think Fast 2.0 and Ultravox v0.4.1 Llama 3.1 8B do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Grok Voice Think Fast 2.0 | Ultravox v0.4.1 Llama 3.1 8B |
|----------|----------|----------|
| Creator | xAI | Fixie AI |
| Type | Proprietary | Open Weight |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | N/A | N/A |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 0 | 0 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | Pricing unavailable / Pricing unavailable |

## Category Breakdown

## FAQ

### Can I compare Grok Voice Think Fast 2.0 and Ultravox v0.4.1 Llama 3.1 8B on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Grok Voice Think Fast 2.0 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-voice-think-fast-2-0)
- [Ultravox v0.4.1 Llama 3.1 8B vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-ultravox-v0-4-1-llama-3-1-8b)
- [Grok Voice Think Fast 2.0 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-voice-think-fast-2-0)
- [Ultravox v0.4.1 Llama 3.1 8B vs GPT-6 Astra](/compare/gpt-6-astra-vs-ultravox-v0-4-1-llama-3-1-8b)

## Explore More

- [Grok Voice Think Fast 2.0 profile](/models/grok-voice-think-fast-2-0)
- [Ultravox v0.4.1 Llama 3.1 8B profile](/models/ultravox-v0-4-1-llama-3-1-8b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)