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DeepSeekDeepSeek V4 ProVSGoogleGemini 2.5 Flash

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

Our Take

We recommend DeepSeek V4 Pro for complex complex codebases, multi-file repositories, and architectural planning, or the 2.6x cheaper Gemini 2.5 Flash if your budget requires optimizing costs for very high-volume pipelines. While DeepSeek V4 Pro offers a clear reasoning advantage, it carries a moderate price premium. Choose DeepSeek V4 Pro for architectural codebase planning, or Gemini 2.5 Flash to save on API costs for simple scripts.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: DeepSeek V4 Pro was evaluated on SWE-bench Pro (scoring 52.1%), 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 Pro scored 88%, while Gemini 2.5 Flash scored 68.3%.
  • Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 2.6x cheaper than DeepSeek V4 Pro ($1.74/M input, $3.48/M output).
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    Model Specs

    DeepSeek V4 Pro

    Open SourceAPI Available
    Website🤗HF

    Benchmarks & Scores

    Coding (swe-bench-pro)
    52.1%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+19.7%)
    88%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $2.17Input: $1.74 | Output: $3.48
    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)2.6x cheaper
    $0.85Input: $0.30 | Output: $2.50
    Context Window
    1.05M tokens
    Read our data collection methodology

    Frequently Asked Questions about DeepSeek V4 Pro vs Gemini 2.5 Flash

    Gemini 2.5 Flash is cheaper than DeepSeek V4 Pro. Gemini 2.5 Flash has a blended cost of $0.85/1M tokens, which is about 2.6x cheaper than DeepSeek V4 Pro at $2.17/1M tokens.

    For coding tasks, DeepSeek V4 Pro scores 52.1% 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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