DeepSeekDeepSeek V4 FlashVSGoogleGemini 2.5 Pro

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

We recommend Gemini 2.5 Pro if you need peak intelligence for complex multi-file code and clearly defined tasks, or the 19.6x cheaper DeepSeek V4 Flash if your workflow is limited to complex codebases, multi-file repositories, and architectural planning. While Gemini 2.5 Pro holds a major reasoning advantage, DeepSeek V4 Flash is optimized for high-volume budget pipelines. Choose Gemini 2.5 Pro for multi-file code and clearly defined tasks, or DeepSeek V4 Flash to maximize your budget for basic scripts.

▶WHY?

Benchmark Calculations & Evidence:

Coding Evaluation: DeepSeek V4 Flash was evaluated on SWE-bench Pro (scoring 49.1%), while Gemini 2.5 Pro was evaluated on SWE-bench Verified (scoring 59.6%).

Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 2.5 Pro scored 84.4%, while DeepSeek V4 Flash scored 80%.

Cost Efficiency: DeepSeek V4 Flash pricing ($0.14/M input, $0.28/M output) is 19.6x cheaper than Gemini 2.5 Pro ($1.25/M input, $10/M output).

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Model Specs

DeepSeek V4 Flash

Open SourceAPI Available

Website 🤗HF

Benchmarks & Scores

Coding (swe-bench-pro)

49.1%

complex codebases, multi-file repositories, and architectural planning

Reasoning (gpqa-diamond)

80%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)19.6x cheaper

$0.17Input: $0.14 | Output: $0.28

Context Window

1.05M tokens

Model Specs

Gemini 2.5 Pro

Website

Benchmarks & Scores

Coding (swe-bench-verified)

59.6%

multi-file code and clearly defined tasks

Reasoning (gpqa-diamond)Winner (+4.4%)

84.4%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$3.44Input: $1.25 | Output: $10.00

Context Window

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about DeepSeek V4 Flash vs Gemini 2.5 Pro

DeepSeek V4 Flash is cheaper than Gemini 2.5 Pro. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 19.6x cheaper than Gemini 2.5 Pro at $3.44/1M tokens.

For coding tasks, DeepSeek V4 Flash scores 49.1% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning), while Gemini 2.5 Pro scores 59.6% on swe-bench-verified (multi-file code and clearly defined tasks).

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