DeepSeekDeepSeek V4 FlashVSGoogleGemini 3 Flash

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

Our Take

We recommend Gemini 3 Flash if you need peak intelligence for complex multi-file code and clearly defined tasks, or the 6.4x cheaper DeepSeek V4 Flash if your workflow is limited to complex codebases, multi-file repositories, and architectural planning. While Gemini 3 Flash holds a major reasoning advantage, DeepSeek V4 Flash is optimized for high-volume budget pipelines. Choose Gemini 3 Flash 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 3 Flash was evaluated on SWE-bench Verified (scoring 78%).

Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3 Flash scored 90.4%, while DeepSeek V4 Flash scored 80%.

Cost Efficiency: DeepSeek V4 Flash pricing ($0.14/M input, $0.28/M output) is 6.4x cheaper than Gemini 3 Flash ($0.5/M input, $3/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)6.4x cheaper

$0.17Input: $0.14 | Output: $0.28

Context Window

1.05M tokens

Model Specs

Gemini 3 Flash

Website

Benchmarks & Scores

Coding (swe-bench-verified)

78%

multi-file code and clearly defined tasks

Reasoning (gpqa-diamond)Winner (+10.4%)

90.4%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$1.13Input: $0.50 | Output: $3.00

Context Window

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about DeepSeek V4 Flash vs Gemini 3 Flash

DeepSeek V4 Flash is cheaper than Gemini 3 Flash. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 6.4x cheaper than Gemini 3 Flash at $1.13/1M tokens.

For coding tasks, DeepSeek V4 Flash scores 49.1% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning), while Gemini 3 Flash scores 78% on swe-bench-verified (multi-file code and clearly defined tasks).

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