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DeepSeekDeepSeek V4 FlashVSGoogleGemini 3.5 Flash

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

Our Take

We recommend Gemini 3.5 Flash if you need peak intelligence for reasoning and coding tasks, or the 19.3x cheaper DeepSeek V4 Flash to optimize your budget for high-volume pipelines. While Gemini 3.5 Flash holds a clear performance lead, it carries a heavy price premium. Choose Gemini 3.5 Flash for complex logic, or DeepSeek V4 Flash for budget efficiency.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. Gemini 3.5 Flash scored 55.1%, while DeepSeek V4 Flash scored 49.1%.
  • Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. Gemini 3.5 Flash scored 92.2%, while DeepSeek V4 Flash scored 80%.
  • Cost Efficiency: DeepSeek V4 Flash pricing ($0.14/M input, $0.28/M output) is 19.3x cheaper than Gemini 3.5 Flash ($1.5/M input, $9/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)19.3x cheaper
    $0.17Input: $0.14 | Output: $0.28
    Context Window
    1.05M tokens
    Model Specs

    Gemini 3.5 Flash

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)Winner (+6.0%)
    55.1%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+12.2%)
    92.2%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $3.38Input: $1.50 | Output: $9.00
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about DeepSeek V4 Flash vs Gemini 3.5 Flash

    DeepSeek V4 Flash is cheaper than Gemini 3.5 Flash. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 19.3x cheaper than Gemini 3.5 Flash at $3.38/1M tokens.

    Gemini 3.5 Flash is better for coding tasks on this benchmark. It scores 55.1% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to DeepSeek V4 Flash which scores 49.1%.

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