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GoogleGemini 2.5 FlashVSOpenAIGPT-5.4 mini

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

Our Take

We recommend GPT-5.4 mini for complex complex codebases, multi-file repositories, and architectural planning, or the 2.0x cheaper Gemini 2.5 Flash if your budget requires optimizing costs for very high-volume pipelines. While GPT-5.4 mini offers a clear reasoning advantage, it carries a moderate price premium. Choose GPT-5.4 mini for architectural codebase planning, or Gemini 2.5 Flash to save on API costs for simple scripts.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Gemini 2.5 Flash was evaluated on SWE-bench Verified (scoring 60.4%), while GPT-5.4 mini was evaluated on SWE-bench Pro (scoring 54.4%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.4 mini scored 87.5%, while Gemini 2.5 Flash scored 68.3%.
  • Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 2.0x cheaper than GPT-5.4 mini ($0.75/M input, $4.5/M output).
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    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)2.0x cheaper
    $0.85Input: $0.30 | Output: $2.50
    Context WindowLarger
    1.05M tokens
    Model Specs

    GPT-5.4 mini

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)
    54.4%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+19.2%)
    87.5%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)
    $1.69Input: $0.75 | Output: $4.50
    Context Window
    400k tokens
    Read our data collection methodology

    Frequently Asked Questions about Gemini 2.5 Flash vs GPT-5.4 mini

    Gemini 2.5 Flash is cheaper than GPT-5.4 mini. Gemini 2.5 Flash has a blended cost of $0.85/1M tokens, which is about 2.0x cheaper than GPT-5.4 mini at $1.69/1M tokens.

    For coding tasks, Gemini 2.5 Flash scores 60.4% on swe-bench-verified (multi-file code and clearly defined tasks), while GPT-5.4 mini scores 54.4% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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