Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning): The Ultimate Performance & Pricing Comparison

Deep dive into reasoning, benchmarks, and latency insights.

The Final Verdict in the Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) Showdown

After a comprehensive analysis, Claude 4.5 Sonnet (Reasoning) emerges as the superior choice for users prioritizing raw intelligence and reasoning. However, Gemini 2.5 Flash Preview (Sep '25) (Reasoning) remains a highly competitive option, especially for scenarios demanding faster response times and cost-efficiency. This detailed Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (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.

Claude 4.5 Sonnet (Reasoning)

Anthropic

Reasoning: 9
Coding: 4
Multimodal: 4
Long Context: 5
Blended Price / 1M tokens: $0.006
P95 Latency: 1000ms
Tokens per second: 69.032tokens/sec

Gemini 2.5 Flash Preview (Sep '25) (Reasoning)

Google

Reasoning: 8
Coding: 2
Multimodal: 3
Long Context: 4
Blended Price / 1M tokens: $0.001
P95 Latency: 1000ms
Tokens per second: 295.309tokens/sec

Overall Capabilities

The capability radar provides a holistic view of the Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) matchup. This chart illustrates each model's strengths and weaknesses at a glance, forming a cornerstone of our Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) analysis.

This radar chart visually maps the core capabilities (reasoning, coding, math proxy, multimodal, long context) of `Claude 4.5 Sonnet (Reasoning)` vs `Gemini 2.5 Flash Preview (Sep '25) (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 Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) debate, Claude 4.5 Sonnet (Reasoning) scores 90 against Gemini 2.5 Flash Preview (Sep '25) (Reasoning)'s 80. This data-driven approach is essential for any serious Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (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 Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) decision for interactive applications. The metrics below highlight the trade-offs you should weigh before shipping to production.

Time to First Token

Claude 4.5 Sonnet (Reasoning)300ms

Gemini 2.5 Flash Preview (Sep '25) (Reasoning)300ms

Tokens per Second

Claude 4.5 Sonnet (Reasoning)69.032

Gemini 2.5 Flash Preview (Sep '25) (Reasoning)295.309

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The Economics of Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning)

Power is only one part of the equation. This Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (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, Claude 4.5 Sonnet (Reasoning) would cost $0.007, whereas Gemini 2.5 Flash Preview (Sep '25) (Reasoning) would cost $0.001. This practical calculation is vital for any developer considering the Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) choice.

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Which Model Wins the Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) Battle for You?

Choose Claude 4.5 Sonnet (Reasoning) if...

Your top priority is raw performance and capability.

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

Cost is a secondary concern to power in your Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) decision.

Choose Gemini 2.5 Flash Preview (Sep '25) (Reasoning) if...

You need a highly responsive model for user-facing applications.

Your budget is a primary consideration in the Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) choice.

You are developing at scale where operational costs are critical.

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Your Questions about the Claude 4.5 Sonnet (Reasoning) vs Gemini 2.5 Flash Preview (Sep '25) (Reasoning) Comparison

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Data source: https://artificialanalysis.ai/