Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning): The Ultimate Performance & Pricing Comparison

Deep dive into reasoning, benchmarks, and latency insights.

The Final Verdict in the Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) Showdown

After a comprehensive analysis, Grok 4.1 Fast (Reasoning) emerges as the superior choice for users prioritizing raw intelligence and reasoning. However, Gemini 2.5 Flash Preview (Reasoning) remains a highly competitive option, especially for scenarios demanding faster response times and cost-efficiency. This detailed Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) 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

Gemini 2.5 Flash Preview (Reasoning)

Google

Reasoning: 6
Coding: 6
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 Gemini 2.5 Flash Preview (Reasoning) matchup. This chart illustrates each model's strengths and weaknesses at a glance, forming a cornerstone of our Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) analysis.

This radar chart visually maps the core capabilities (reasoning, coding, math proxy, multimodal, long context) of `Grok 4.1 Fast (Reasoning)` vs `Gemini 2.5 Flash Preview (Reasoning)`.

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 Gemini 2.5 Flash Preview (Reasoning) debate, Grok 4.1 Fast (Reasoning) scores 90 against Gemini 2.5 Flash Preview (Reasoning)'s 60. This data-driven approach is essential for any serious Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) 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 Gemini 2.5 Flash Preview (Reasoning) 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

Gemini 2.5 Flash Preview (Reasoning)300ms

Tokens per Second

Grok 4.1 Fast (Reasoning)182.829

Gemini 2.5 Flash Preview (Reasoning)27

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The Economics of Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning)

Power is only one part of the equation. This Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) 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 Gemini 2.5 Flash Preview (Reasoning) would cost $0.018. This practical calculation is vital for any developer considering the Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) choice.

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Which Model Wins the Grok 4.1 Fast (Reasoning) vs Gemini 2.5 Flash Preview (Reasoning) 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 Gemini 2.5 Flash Preview (Reasoning) 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 Gemini 2.5 Flash Preview (Reasoning) Comparison

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Data source: https://artificialanalysis.ai/