Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B: The Ultimate Performance & Pricing Comparison

Deep dive into reasoning, benchmarks, and latency insights.

The Final Verdict in the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B Showdown

After a comprehensive analysis, Grok 4.1 Fast (Reasoning) emerges as the superior choice for users prioritizing raw intelligence and reasoning. However, Llama 3.1 Instruct 405B remains a highly competitive option, especially for scenarios demanding faster response times and cost-efficiency. This detailed Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B comparison will break down every critical metric to help you make the best decision.

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Model Snapshot

Key decision metrics at a glance.

Grok 4.1 Fast (Reasoning)

xAI

Reasoning: 9
Coding: 3
Multimodal: 3
Long Context: 5
Blended Price / 1M tokens: $0.000
P95 Latency: 1000ms
Tokens per second: 182.829tokens/sec

Llama 3.1 Instruct 405B

Overall Capabilities

The capability radar provides a holistic view of the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B matchup. This chart illustrates each model's strengths and weaknesses at a glance, forming a cornerstone of our Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B analysis.

This radar chart visually maps the core capabilities (reasoning, coding, math proxy, multimodal, long context) of `Grok 4.1 Fast (Reasoning)` vs `Llama 3.1 Instruct 405B`.

Benchmark Breakdown

For a granular look, this chart directly compares scores across standardized benchmarks. In the critical MMLU Pro test, a key part of the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B debate, Grok 4.1 Fast (Reasoning) scores 90 against Llama 3.1 Instruct 405B's 10. This data-driven approach is essential for any serious Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B comparison.

This grouped bar chart provides a side-by-side comparison for each benchmark metric.

Speed & Latency

Speed is a crucial factor in the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B decision for interactive applications. The metrics below highlight the trade-offs you should weigh before shipping to production.

Time to First Token

Grok 4.1 Fast (Reasoning)300ms

Llama 3.1 Instruct 405B300ms

Tokens per Second

Grok 4.1 Fast (Reasoning)182.829

Llama 3.1 Instruct 405B24.711

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The Economics of Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B

Power is only one part of the equation. This Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B pricing analysis gives you a true sense of value.

Pricing Breakdown

Compare input and output pricing at a glance.

Real-World Cost Scenario

To process 1M input tokens and generate 250k output tokens, Grok 4.1 Fast (Reasoning) would cost $0.000, whereas Llama 3.1 Instruct 405B would cost $0.005. This practical calculation is vital for any developer considering the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B choice.

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Which Model Wins the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B Battle for You?

Choose Grok 4.1 Fast (Reasoning) if...

Your top priority is raw performance and capability.

You are working in a technical or scientific field requiring the highest accuracy.

You need the most advanced reasoning capabilities available.

Choose Llama 3.1 Instruct 405B if...

You are developing at scale where operational costs are critical.

You prioritize cost-effectiveness over maximum performance.

Your workload requires consistent, reliable performance.

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Your Questions about the Grok 4.1 Fast (Reasoning) vs Llama 3.1 Instruct 405B Comparison

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Data source: https://artificialanalysis.ai/