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GoogleGemini 2.5 FlashVSOpenAIGPT-5.4 nano

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

Our Take

We recommend GPT-5.4 nano for superior overall value and reasoning capabilities, as it is cheaper or equal in cost while delivering peak intelligence. While GPT-5.4 nano 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 GPT-5.4 nano for architectural codebase planning, or Gemini 2.5 Flash if you specifically require its simpler functions profile.
▶WHY?
Benchmark Calculations & Evidence:
  • Coding Evaluation: Gemini 2.5 Flash was evaluated on SWE-bench Verified (scoring 60.4%), while GPT-5.4 nano was evaluated on SWE-bench Pro (scoring 52.4%).
  • Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.4 nano scored 82.8%, while Gemini 2.5 Flash scored 68.3%.
  • Cost Efficiency: Gemini 2.5 Flash pricing ($0.3/M input, $2.5/M output) is 0.5x cheaper than GPT-5.4 nano ($0.2/M input, $1.25/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)
    $0.85Input: $0.30 | Output: $2.50
    Context WindowLarger
    1.05M tokens
    Model Specs

    GPT-5.4 nano

    Website

    Benchmarks & Scores

    Coding (swe-bench-pro)
    52.4%

    complex codebases, multi-file repositories, and architectural planning

    Reasoning (gpqa-diamond)Winner (+14.5%)
    82.8%

    graduate-level science QA

    Cost & Context

    Cost (per 1M tokens)1.8x cheaper
    $0.46Input: $0.20 | Output: $1.25
    Context Window
    400k tokens
    Read our data collection methodology

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

    GPT-5.4 nano is cheaper than Gemini 2.5 Flash. GPT-5.4 nano has a blended cost of $0.46/1M tokens, which is about 1.8x cheaper than Gemini 2.5 Flash at $0.85/1M 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 nano scores 52.4% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).

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