Grok 4.1 Fast (Reasoning) vs K2 Think V2: The Ultimate Performance & Pricing Comparison

Deep dive into reasoning, benchmarks, and latency insights.

The Final Verdict in the Grok 4.1 Fast (Reasoning) vs K2 Think V2 Showdown

After a comprehensive analysis, Grok 4.1 Fast (Reasoning) emerges as the superior choice for users prioritizing raw intelligence and reasoning. However, K2 Think V2 remains a highly competitive option, especially for scenarios demanding faster response times and cost-efficiency. This detailed Grok 4.1 Fast (Reasoning) vs K2 Think V2 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

K2 Think V2

Other

Reasoning: 6
Coding: 2
Multimodal: 2
Long Context: 3
Blended Price / 1M tokens: $0.015
P95 Latency: 1000ms
Tokens per second: —

Overall Capabilities

The capability radar provides a holistic view of the Grok 4.1 Fast (Reasoning) vs K2 Think V2 matchup. This chart illustrates each model's strengths and weaknesses at a glance, forming a cornerstone of our Grok 4.1 Fast (Reasoning) vs K2 Think V2 analysis.

This radar chart visually maps the core capabilities (reasoning, coding, math proxy, multimodal, long context) of `Grok 4.1 Fast (Reasoning)` vs `K2 Think V2`.

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 K2 Think V2 debate, Grok 4.1 Fast (Reasoning) scores 90 against K2 Think V2's 60. This data-driven approach is essential for any serious Grok 4.1 Fast (Reasoning) vs K2 Think V2 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 K2 Think V2 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

K2 Think V2300ms

Tokens per Second

Grok 4.1 Fast (Reasoning)182.829

K2 Think V258

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The Economics of Grok 4.1 Fast (Reasoning) vs K2 Think V2

Power is only one part of the equation. This Grok 4.1 Fast (Reasoning) vs K2 Think V2 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 K2 Think V2 would cost $0.018. This practical calculation is vital for any developer considering the Grok 4.1 Fast (Reasoning) vs K2 Think V2 choice.

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Which Model Wins the Grok 4.1 Fast (Reasoning) vs K2 Think V2 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 K2 Think V2 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 K2 Think V2 Comparison

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Data source: https://artificialanalysis.ai/