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DeepSeekDeepSeek V4 FlashVSGoogleGemini 2.5 Flash

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

Our Take

We recommend DeepSeek V4 Flash for superior overall value and reasoning capabilities, as it is cheaper or equal in cost while delivering peak intelligence. While DeepSeek V4 Flash excels at complex complex codebases, multi-file repositories, and architectural planning, Gemini 2.5 Flash is suited for scripting multi-file code and clearly defined tasks. Choose DeepSeek V4 Flash for architectural codebase planning, or Gemini 2.5 Flash if you specifically require its simpler functions profile.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: DeepSeek V4 Flash was evaluated on SWE-bench Pro (scoring 49.1%), while Gemini 2.5 Flash was evaluated on SWE-bench Verified (scoring 60.4%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. DeepSeek V4 Flash scored 80%, while Gemini 2.5 Flash scored 68.3%.
  • Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 0.2x cheaper than DeepSeek V4 Flash ($0.14/M input, $0.28/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)Winner (+11.7%)
    80%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)4.9x cheaper
    $0.17Input: $0.14 | Output: $0.28
    Context Window
    1.05M tokens
    Model Specs

    Gemini 2.5 Flash

    Website

    Benchmarks & Scores

    Coding (swe-bench-verified)
    60.4%

    multi-file code and clearly defined tasks

    Reasoning (gpqa-diamond)
    68.3%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $0.85Input: $0.30 | Output: $2.50
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about DeepSeek V4 Flash vs Gemini 2.5 Flash

    DeepSeek V4 Flash is cheaper than Gemini 2.5 Flash. DeepSeek V4 Flash has a blended cost of $0.17/1M tokens, which is about 4.9x cheaper than Gemini 2.5 Flash at $0.85/1M 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 Flash scores 60.4% on swe-bench-verified (multi-file code and clearly defined tasks).

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